Sometimes it's the smallest thing in a software update that means the most to some users. This latest iPhone update contains a few little gems that should not be lost in all the excitement over new iPod hardware.

One of the nicest additions is the ability to remotely lock your iPhone if you're a MobileMe subscriber. It could be very helpful if you've left it somewhere and are not sure where, or you know it's stolen but don't want to wipe all your content in case the phone is quickly recovered. This doesn't replace the very welcome remote wipe feature, but it is a nice add-on.

The place to activate the remote lock is on your MobileMe settings page, which you can access from a web browser. You can give a four digit code, and if your phone is turned on it will immediately lock. You will also get a confirmation e-mail from Apple.

One item to note, once you have done this, it is not a one-time thing. When you get your phone back and you unlock it, it will lock up again when your auto-lock activates unless you turn the feature off in your iPhone settings. I tested the remote lock function, and it worked as advertised.

Another worthwhile addition in the iPhone 3.1 software is the ability, finally, to use Bluetooth voice commands with a Bluetooth headset. This feature should have been included in the iPhone 3.0 software, but I am glad to see Apple address this obvious shortcoming,

With my Jabra Bluetooth headset I could initiate a voice call without any problem. I also asked the phone what song is playing and got the correct answer, but the voice responded through the phone and not the headset. No big thing.

It's nice to see Apple cleaning up some of these little issues as the iPhone moves forward. Wonder where it will be in a year?

Let's face it, the less distractions you have while driving the better, even if the government can't decide whether or not to tell you how dangerous phones + cars can be. Last week I was happy to see Penn Jillette (a magician whose work I've admired since I was too young to say the name of his current show) on Twitter proudly announce he was going to quit calling and texting in the car. Bravo!

Penn happens to sport an iPhone, and like any modern cell phone, it has "airplane mode." I'm going to show you how to set the iPhone to this "no call" mode, and explain why you probably don't have to while driving. Plus, if you absolutely must talk while driving I'll explain a helpful trick with the 3GS. You should never under any circumstances try to type while driving -- pull over, already.

To turn off your iPhone's cell radio, thus preventing distracting text messages, push messages and phone calls, go to Settings > Airplane Mode and turn the switch ON. Pretty easy, yes, I know. But unless you are going to use the iPhone's audio in your car (and there's like a zillion apps for that), you could just as easily turn off the ringer. The switch above the volume buttons on the left of the screen controls the mute for external sounds. When you arrive at your destination, check your phone for missed calls, etc.

If you have a 3GS, you can use the Apple headphones that came with it to activate Voice Control, giving you a relatively safe method of interacting with your iPhone while driving (except for a proper, Bluetooth speaker/mic or in-car solution, I guess). Plug in the headphones and put the headphone directly connected to the microphone in your ear. Press and hold the "middle" button (in-between the volume buttons) for about 3 seconds, until you hear the beeps. Voice Control is now on! You can control the iPod functions and make calls, but I recommend you try Voice Control before you start driving. Note that there are voice dialing apps for previous iPhones, but I feel having to see the screen to push even one button is an unacceptable distraction.

The New York Times and many other news outlets have reported on the unreleased government study showing that even talking on the phone increased the likelihood of having an accident -- whether you are hands-free calling or not. Driving and chatting with a disembodied voice can be distracting, apparently. So, again, the only truly safe thing to do is to switch off your cell radio entirely (Airplane mode). This won't allow you to play streaming radio stations, but it may save your life. Otherwise, use your willpower to ignore the chimes, rings and buzzes, and if you absolutely must talk or text, pull over.

The iPhone Blog is reporting what's purported to be in the next, and hopefully imminent iPhone update to version 3.1. As we've reported, developers were seeded with the beta Tuesday.

Here's the list:

• Voice Control now works over Bluetooth
• Updated AT&T profile to 4.2 (MMS is now enabled)
• Improvements to OpenGL and Quartz.
• iPhone vibrates when moving icons
• Non-destructive video editing means trimming a clip no longer saves over the original video but gives you the option to "Save as copy..."
• APIs to allow third party apps to access videos and edit them.
• Updated modem firmware to 5.08.01

If true, it will put smiles on a lot of iPhone owners' faces. The omission of Bluetooth voice control seemed downright silly. Losing your original video after an edit seemed pretty counter-intuitive as well. It also appears MMS will appear in the update, but that only matters if AT&T turns it on.

No firm dates for the update of course, but if the above is accurate it will be a good one.

Thanks Brad for the tip

Pity the poor iPhone 3G owner who now has to grapple with reality; yes, what was until Friday the world's coolest smartphone is now simply a piece of yesterday's tech, as current as a punchcard and as enduring as a wax cylinder recording on a hot afternoon. No, not really -- the iPhone 3G is just as cool as it was a week ago, and for $99 it's a relative bargain. Still, there's some envy on the wind.

Some of our readers have apparently been so dazzled by Apple's enthusiastic promotion of the new iPhone 3G S that they were fooled into believing that the hardware-linked features of the 3G S (the compass and the voice controls, specifically) would be made available on the 3G with the delivery of the 3.0 software update. They have written to us, irate and frustrated, wanting to know what happened to their promised features. We sympathize, and we want to help.

There is, as it happens, a way to get one of the marquee features of the 3G S -- voice control -- onto your iPhone 3G or original iPhone. The vlingo app, available free in the App Store since December of last year and also available for Blackberry & Windows Mobile, gives you voice command dialing from your address book, map search, Yahoo web searches, Twitter/Facebook updating, and more. The recognition quality is quite good; it's worked as well as Google Voice Search for me in most cases.

Vlingo is quite a bit slower to recognize audio on the 3G than the built-in Voice Control is on the 3G S (unsurprisingly, considering the horsepower boost on the new phone); it also does not allow iTunes control, while Apple's tool does. Despite these drawbacks, it's fun to use and very slick. Update: As Eitan points out in the comments, vlingo's speed is not necessarily limited by the local processing power, since it depends on the remote server for audio analysis.

One of the major points of contention regarding vlingo, and a cause of many negative reviews on the App Store, is that the app does have to do something a little bit touchy in order to enable voice dialing: it asks if it can upload your contact names to vlingo. While this is a necessary step if you want to use voice dialing, and while the company says it does not include phone numbers with that upload nor does it use the information for any purpose other than creating spoken profiles to recognize the names of your contacts when you speak them, there are plenty of users who aren't comfortable with this step. If you're not OK with it, you can still use vlingo without the voice dialing feature; at that point, however, it's not dramatically better than Google's Voice Search.

You can watch a video demo of vlingo in the 2nd half of this post. If you've got other workarounds or third-party apps that help 3G owners level up with their happy 3G S comrades, please let us know.