It was just yesterday that Apple announced they would allow free apps to enable in-app purchases, and developers are already jumping on the "get the app for free, buy the content later" business model as quickly as they can. ngmoco came out swinging, as Touch Arcade reports, with both a free intro version of Rolando 2 out for purchase, with later chapters of the game as add-ons. They've also been working on a shooter called Eliminate, and we're now told that title will be free as well, with extra content to buy later.

The creators of Urban Rivals, an app that is based on a virtual trading card game, have let us know that they too plan to go the free-with-microtransactions model as soon as their app is released, and though we haven't actually heard from Tapulous, Andrew Lacy told us outright that the only reason Tap Tap Revenge 3 had a 99 cent price tag on it was because of Apple's limitation, so we'll expect that app to go free as soon as it can.

Clearly, there's a drive for this model on the developer side, but the question will be just how much this echoes with consumers -- certainly the "download a trial, buy more later" model has worked well on other platforms, so we can expect it to work here on the App Store as well. But on the other hand, just as when the App Store first opened for business, it's a very "wild west" moment -- everybody and their brother is offering up in-app transactions, and they're all of varying prices and quality.

My guess is that we'll see a few "hits" -- a few free apps that everybody buys content for (Tap Tap Revenge 3 is a good guess; considering that because you know most of those songs, there's much less guessing on what the quality of the transactions will give you). At the same time, there will likely be apps that everyone agrees aren't worth the in-app purchase (it's the old story of "horse armor" when Xbox Live started doing microtransactions). Until we find a good balance, where quality meets price, odds are that it'll be tough for consumers to know just what's worth it, and thus tough for developers to convince them that their content is.

Tapulous has released a version of its mega-popular Tap Tap Revenge app geared toward Dave Matthews fans. Dave Matthews Band Revenge (link opens iTunes) costs $4.99US and includes 10 songs from the band, including two from its upcoming album "Big Whiskey and the GrooGrux King." Additional features include multi-player mode, a news feed for the Dave Matthews Band, and Facebook Connect for sharing scores.

In addition to the regular flavors of Tap Tap Revenge, the Dave Matthews version also joins a dance version of the game, as well as one for Coldplay fans that was released last month.

[via Touch Arcade]

Tapulous unveiled the latest version of its megapopular iPhone music game franchise, Tap Tap Revenge 2 (link opens iTunes), a few days ago. While it has become the top free app in the App Store, the program is plagued with several issues due its massive popularity.

An update posted on the App Store yesterday lets users know that Tapulous is experiencing network problems that are leading to issues with music downloads and online play -- in addition to the app itself crashing. Tapulous has promised a resolution to the network issues as soon as possible, and there should be an update to Tap Tap Revenge 2 over the next few days.

Tap Tap Revenge 2 features more than 150 free tracks and three ways to play with friends -- Challenge mode, Two Player Split-Screen and Online Play. You can also progress through Career mode and share your results with that as well.

Tap Tap Revenge 2 improves on an already fantastic game, and retains the same free price as the original. However, you may want to wait a couple days for the network problems to be resolved in order to take full advantage of the update. You can check out Tapulous' blog to see the progress on these issues.

Thanks to all who submitted this!

When Tapulous released Christmas with Weezer [iTunes link] for the iPhone and iPod touch last week, I was pretty excited, as it combined three of my favorite things: Weezer, Christmas music and Tap Tap Revenge.

The tough economic climate, stresses over moving two days before I leave for Macworld 2009 and a hectic schedule have given me less holiday cheer than usual, but I'm happy to say, Christmas with Weezer is helping to turn that around.

Christmas with Weezer takes Tap Tap Revenge's addictive format and adds to it some Christmas cheer. Not only do Rivers and company perform a bevy of Christmas classics, the interface is all wrapped up for Christmas.

The Kids Mode is great for anyone starting out with TTR or for kids who want to get in on the fun. Christmas with Weezer also features the multi-tap and tap and hold game elements introduced in the recently released, Tap Tap Dance (iTunes link).

Check out the gallery below. Christmas with Weezer is $4.99 and available in the App Store.

There are a number of Twitter apps available for the iPhone and iPod Touch -- and why not? Much like peanut butter and jelly, Twitter and the iPhone are a classic combination. Tweetsville [iTunes Link] from Tapulous is the newest Twitter client available from the App Store, and it offers up an interface and feature set that really gives the competition a run for its money.

But wait, doesn't Tapulous already make a Twitter application? They do, and Twinkle [iTunes Link] is a neat app. Although the two applications share some interface similarities, the scope and focus are actually very different. Twinkle's real user hook is in its geo-location features, whereas Tweetsville is a full-fledged Twitter application.

I'm a pretty addicted to Twitter, and have been searching for an app for my iPod touch that could help me monitor and manage my stream with ease. Tweetsville appears to be that app. I follow a lot of users and my biggest problem with some of the other Twitter applications (and with the m.twitter.com interface) is that I can't view a large number of tweets at one time. With Tweetsville, not only does it grab the last 200 tweets for me, if I leave the application and come back an hour later, it will pull up what I've missed. That means I can access 532 tweets at once, rather than just the last ten minutes or so. That's extremely handy.

Read on for more...

It's a week of superlatives for Apple content providers!

Tapulous announced that their free game for iPhone 2.0 / iPod touch, Tap Tap Revenge (click opens iTunes) should reach the one million download mark sometime this weekend. Tap Tap Revenge joins Facebook in the million-download club, with Facebook being the first app to reach these lofty heights last week. A visit to the Tapulous website shows a counter ticking off the downloads (less than five thousand to go as of 10:42 AM ET today).

Tap Tap Revenge uses soundtrack music by indie artists and over 2.5 million song downloads have been counted so far. Tapulous is now approaching the major labels on a "Pro" version of the game that would feature music by top stars.

On Wednesday, Walt Disney Co. announced that they have sold over 5 million movies to viewers through the iTunes Store since the company started offering their releases online. While Disney CEO and President Rob Iger noted that although the company doesn't achieve the same margin on online sales as they do through traditional channels, it's the increase in online consumption of movies that the company is focusing on.

[Disney info via Marketwatch]

The iPhone will no doubt see it's fair share of Twitter clients (just as the Mac has). Twitterrific is the big name in the Mac/iPhone Twitter app space, but in a client from Tapulous called "Twinkle" has also been generating some interest. Originally released as a jailbreak application for the iPhone and iPod touch, Twinkle has just debuted on the App Store with the ability to location-base your tweets.

While Twitterrific seems to have more precise locating abilities, Twinkle uses the location-based tweeting in interesting ways. For instance, you can see tweets originating within a certain mileage range from your location. Twinkle allows you to easily view your direct messages.

Overall, Twinkle looks like it will give Twitterrific a run for its money. Best part of all? Twinkle (iTunes Link) for iPhone and iPod touch is absolutely free.

Check out our gallery for some screenshots.

The last time we covered Tap Tap Revenge, the AppStore hadn't yet been released. Now that we've been able to get a hands-on with the app, let's take a new look at TTR by Tapulous. When you first launch this application, you get a fun interface that is very straightforward.

The game play is very simple; just tap along to the beat of the song playing. The red, green and blue colored dots will guide you. There are four difficulty levels: easy, medium, hard, and extreme. Some levels in TTR add in "shakes" that make you shake the iPhone to the left, middle or right to complete the beat (you can turn this feature off in the options). While TTR has the ability to download additional songs, there are currently no new songs available to download (hopefully this will change soon, as you get tired of the same four songs).

In addition to scoring locally, TTR can also interface with an online scoreboard complete with a profile picture. You can also participate in the TTR tournaments for a chance to win a $25 iTunes gift certificate.

Tap Tap Revenge is available for free from the AppStore, so download this amazing application and get your tapping on today!

Nate True, iPhone developer extraordinaire and friend of TUAW (but who isn't, really), has sold off his Tap Tap Revolution game to a company called Tapulous, and they're renaming it Tap Tap Revenge and are going to try selling it in the iPhone's (and iPod touch's) App Store. The game isn't much tweaked from its jailbroken incarnation, but there is a chaotic two-player mode, seen above, that could be a lot of fun. I've never played the original version, so I have no idea what's up with the shaking, but it looks like it incorporates some accelerometer fun as well.

If you're a super TTR fan, Tapulous tells us that they've got a wallpaper to download on their site right now, and that more videos will be coming out over the weekend, so stay tuned. All these games are looking terrific, but of course the one thing we haven't heard confirmed from any of them is when and if they'll be showing up on the App Store. That, it seems, is up to Apple. It doesn't matter how many games you've got ready to go -- if Apple doesn't have them set for download right away, both the devs and iPhone owners will miss a nice opportunity.