I just tried out PhotoNest, a cool new way to view just the images posted to your Twitter stream. It picks up just the photos, and presents them in a slide format, captioned with the tweet they were posted with. You can quickly flick through and see what your friends are up to (based on the photos they post).

Given that Twitter doesn't have a genuine photo-posting mechanism, this seems like a grand idea to me. I've done something similar to collect and expand just the links posted to my stream, but this app does a great job of pulling photos posted with multiple services and presenting them in an easy-to-navigate format.

The only trouble I ran into with PhotoNest was a login issue: when I mistyped my password on the first try, it gave me an error and took me back to the login screen. After that, though, a correct password just kept landing me back at that screen without any message. However, quitting the app and starting it again logged me in automatically without a hitch, so I assume it's a small bug that will be squashed in the next update.

The app will also let you post photos (with a tweet) to your Twitter account, and you can filter your view based on favorite contacts. PhotoNest is available on the App Store for $1.99US. If your Twitter friends post a lot of photos (and people with iPhones tend to), it's a fun way to keep up and worth checking out.

Earlier this week, Wired posted a story about what they call "App Store Payola" -- the practice of sites that solicit cash payments (or other compensation) in order to expedite or publish app reviews. This isn't anything new. Ever since the App Store first went online, there have been sites that have offered developers a chance at the spotlight in return for behind-the-scenes payment. Apparently, it is still going on, and Wired's piece takes a good look at what's under the table.

It should go without saying, but for the record: TUAW isn't involved in this practice, and never has been. We will use promo codes for reviews rather than buying the apps directly, but a promo code doesn't guarantee a review and it definitely doesn't influence our stated opinions on the products we cover. Informally, our editorial team gives a thumbs up to the OATS standard, although TUAW hasn't officially joined the sites promoting the 'code of conduct' for app reviews.

Nevertheless, this is an interesting issue. My main question actually revolves around whether or not this practice actually "works" for the developer -- do devs who pay the $25, or whatever these "Reviews R Us" sites are charging, actually see returns in their product's sales or downloads?

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Silicon Alley Insider has posted an interesting chart that shows the total number of apps available across various mobile platforms. As you can see from the chart, Apple's iPhone leads the pack by a longshot with 170,000 apps according to AppShopper.com. AppShopper typically lists more apps than Apple publicly states it has because AppShopper updates its numbers on a daily basis. As of today's count, AppShopper says Apple has approved 198,924 apps with 171,722 available to download. The discrepancy between the numbers accounts for apps that either the developers or Apple have removed from the App Store. Apple officially states that it currently has 150,000 apps.

A distant second after Apple's App Store is Google's Android Marketplace with 30,000 apps. RIM's Blackberry trails with only 5,000 apps, while Palm has a paltry 2,000. Windows Phone 7 Series Applications were announce a few days ago with a limited number of developers signed on. Of course, these numbers don't take app quality into account at all (100,000 fart apps is still just a bunch of junk), but clearly in terms of available downloads, Apple has a huge lead.

Sprint has released an ad that features the iPhone with its Overdrive 3G/4G Hotspot mobile router. The Overdrive allows you to use Sprint's 4G network with any WiFi capable device.

The ad features "Matt" and the appropriately-named iPhone-owner "Steve."

"My friend Steve's iPhone is cool, but it's limited to AT&T's 3G speeds," Matt says. "So I'm going to use the Overdrive 4G mobile hotspot to make it up to ten times faster. And while that's happening, I'm going to enjoy this tasty snack," at which point Matt pulls out an apple and takes a bite. Steve connects to the Sprint 4G WiFi network on his iPhone and quickly begins streaming a music video which leads him to exclaim, "Whoa. Done." The ad ends with Matt asking, "What can you do with 4G?" before the narrator chimes in, "Whatever you do, do it up to ten times faster than 3G with 4G from Sprint."

Sprint was one of the first to attack the iPhone but now, like most wireless providers, wants to be an official iPhone carrier. Last September Charlie Rose asked Sprint CEO Dan Hesse how the Pre was stacking up against the iPhone, to which he replied, "It's... it's doing well, but you can almost put the iPhone, to be fair, in a separate category. The Apple brand and that device have done so well, it's almost not... it's like comparing someone to Michael Jordan."

Well, if you can't beat the star, why not make some sweet accessories to go along with those Air Jordans?

MacRumors reports that Apple has begun offering iPad 10-packs to educational institutions at discounted rates. The discounts are relatively minor: $20 off of each iPad in a set of 10, or $40 off per iPad if they are ordered with AppleCare. The iPad 10-packs are shipped in a single box, which eliminates individual packaging. In addition to the ten iPads, the packs contain ten power adapters, ten USB-to-Dock cables, and one set of documentation. Currently, only the WiFi models are available in the educational 10-packs. Like the iPhone, there are no iPad educational discounts currently available to students or teachers.

Many believe that the iPad can revolutionize the tools for education. This educational 10-pack could be an early sign that Apple will aggressively pursue the iPad as an educational tool.

The iPad 10-packs begin shipping in April.

Charles Miller, a computer security researcher who's worked with the NSA, is planning to reveal 20 zero-day security holes in Mac OS X at CanSecWest, a digital security conference, in Vancouver BC next week. A zero-day security hole is a weakness in software that neither the makers of the software nor other individuals have any knowledge of. Hackers then take advantage of the exploit on the day it becomes general knowledge. Miller revealing that Mac OS X has twenty of them makes Apple look like they didn't do the job right the first time and also suggests Apple needs glasses to see what they've missed – and he's not wrong.

"Mac OS X is like living in a farmhouse in the country with no locks, and Windows is living in a house with bars on the windows in the bad part of town," Miller said, suggesting that while both OSes have their security flaws, the Mac OS is safer because of the lack of people threatening to exploit it.

But software is software, and no matter how much more secure Mac OS X is than Windows, it's still bound to have some security issues. I'm all for Charles Miller digging around the OS to find flaws, but come on, if you find them, why announce them to the world and open up a potential new round of attacks? Wouldn't it be better to report them to Apple instead of to the host of hackers that pay attention to CanSecWest? There's no question about it, Apple should have caught these holes in the first place and Miller is right in calling them out on it. But while I understand that public outings go a long way to ensuring that people or companies don't make the same mistakes again, you can call Apple out without showing people – especially the wrong people – the specific cracks in the system.

Do you need a weapon that's not as clumsy or random as a blaster, or perhaps, an elegant weapon from a more civilized age? Soon, there will be an app for that. THQ Wireless, the maker of several Star Wars-themed iPhone apps including The Force Unleashed and Star Wars: Trench Run, will release a new app called Lightsaber Duel early in April. Overall, the app sounds similar to another app called Lightsaber Unleashed, which allows you to swing your iPhone around and make "vvvmmm, vvvmmm, tssshh!" noises come out of the speaker.

Lightsaber Duel will expand on that idea. Rather than merely going all Star Wars Kid with your iPhone, you'll actually be able to engage in duels with your fellow wannabe Jedi or Sith via a Bluetooth connection with their iPhone. You'll also be able to play music during the duel. However, we're not yet sure if that means only music bundled with the app, or if you'll be able to play your iTunes music. "Duel of the Fates" and "Battle of the Heroes" are fine lightsaber battle tunes, but the übernerd in me wants to be able to mix it up and throw in a little "One-Winged Angel" from Final Fantasy VII or "Burly Brawl" from Matrix: Reloaded.

THQ hasn't released pricing info yet, but assuming it isn't heinously expensive, this is an app that's likely to hit the top of the App Store charts within hours of its release.

[Via Mashable]

Thursday's Macworld article from Jason Snell on the relative merits of waiting for the 3G iPad sets out a good case for the superiority of the more flexible -- and expensive -- AT&T-enabled units. If you can keep your powder dry during the interminable wait through most of April, while your friends are flaunting their WiFi-only units, you might be better off. For the investment of $130 up front, mobile users get GPS capability plus the wireless broadband equivalent of a reserve chute; whenever you find yourself without solid WiFi access, you can buy into the 250 MB on-demand plan and surf as needed.

He also points out one of the undersung prizes of the AT&T plans; they give unlimited access to the company's WiFi infrastucture across the country, including thousands of Starbucks hotspots and former Wayport networks (lots of hotels and airports, where the daily fee for broadband could quickly add up to the $14.95 you'd pay for a month of 3G). That alone is a noticeable benefit.

I agree with Jason's main point: unless your iPad use model is restricted to known hotspot zones, it makes good sense to consider the 3G units. It's only at the end of the post, in the crystal ball 'n tea leaves department, that I wonder if he's right: anticipating a relatively near-term scenario where the iPad product line unifies to an all-3G offering, and the WiFi-only iPad simply goes away.

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Earlier we were hearing that Apple might get involved in location-based ad-hoc social networking, and now it looks like Plastikman might beat them to the punch. That's the DJ, not the superhero -- he's released an iPhone app that's designed to be used at his concerts this summer, giving you some personal involvement on your iPhone while the music and video of the show goes on around you.

It's a free download, and while at a concert on a free Wi-Fi network, the app will receive real-time information about the music and video during the show, and even give access to some of the samples being used. Outside of shows, the app says it will work as an "atmospheric location shifter," using the iPhone's microphone and headphones to wrap users "in a Plastikman environment." Whatever that means.

The point here is that this is an app actually built for a specific location, adding in specific funcationality when you're on a certain Wi-Fi network. That's a very cool idea. Even if you don't have Plastikman tickets (looks like he's only playing Coachella and one show in Detroit here in the US), the idea of location-specific software is one we'll probably see come up again in the future.

It's time again for another Dear, Apple letter from the readers of TUAW. In our first series (part one, part two, part three) you told us what you want to see in the next iPhone OS. Now we need your help again to tell Apple what you want to see in the next version of Mac OS X.

Think the Finder needs a makeover? Does Mail need improvements? Address Book not cutting it for you? If you have ideas for the Dock, Finder, Dashboard, DVD Player, Exposé, Quick Look, Terminal, Image Capture, Preview, Spotlight, Spaces, Safari, Mail, iCal, Address Book, iChat, QuickTime X, Photo Booth, System Preferences, or Time Machine -- make yourself heard! Tell us what you would change in any of the featured apps in Mac OS X and we'll tell the world (and Apple) for you.

If you're dreaming of what Mac OS X 10.7 should be like, dream big. If you think Linux or Windows does something better and want the Mac OS to have it, tell us. Even if a mobile OS, like iPhone or Android, does something you think the Mac OS can benefit from, don't be afraid to say it.

Email your suggestions to me at tuawmacosx [at] me dot com by next Thursday, March 25th. Please note that only suggestions emailed to the address above will be included, but feel free to hash out your thoughts in the comments below. Also note that this series will not deal with iTunes, iWork or iLife (that's still coming up though). For the iPhone series I received thousands of emails; for the sake of my eyes (and sanity) bulleted lists are much appreciated. Don't be shy about sending in concept drawings or mock-ups either!