Here's another iPhone application that demonstrates that soon there is nothing you won't be able to know if you have just one device. DevToaster has created an app called Rev that reads information straight from the OBD-II port on your car and displays it on your iPhone. When it's fully operational, Rev can display things like vehicle speed, RPM, fuel consumption, calculated engine load, and a host of other parameters. You'll even be able to check and reset engine and error codes.

The coding wizards at 3rd Dimension, Inc. have released an iPhone app that provides a live video stream of traffic in selected areas, allowing commuters to view conditions before they make the trek to and from work.

Currently, the application is only available for Detroit, Harford, Houston, Indianapolis, Kansas City, Knoxville, LA, New York and Washington D.C., but more cities will be added in the future.

The application is a free download through the iTunes store (search for "traffic" and you'll see the available cities), and after checking out the New York feeds, we're astounded at how many traffic cameras are available in the Big Apple.

One day after spotting the "inexpensive" auto performance measurement tool Dynolicious for the iPhone, we've found another, and it's much cheaper. Liberty For One has released its own automotive measurement tool called g-tac, and its going for just $4.99. For less than half the cost of the Dynolicious tool, you get times and trap speed for the quarter mile, as well as times for 0-60 and 60-0. The g-tac utilizes the iPhone's (and iPod Touch's) accelerometer to determine velocity, so the phone doesn't have to be plugged into the car. The tool also graphs out your last three runs so you can hone your launch technique over time.

The world has gone iPhone crazy since Apple released v2.0 of its sleek mobile device, and while GPS and 3G have been big draws, the multitude of available software apps in the new App Store has been the real wild card. One app that has us really psyched is a new automotive performance meter called Dynolicious from BunsenTech. It uses the accelerometer inside the iPhone to let you record 0-10 through 0-100 times, quarter mile and trap speed, Lateral Gs, horsepower and more. Results are also displayed in real-time on the phone itself with graphs and a speedometer. You can also configure the tool with updates to your car, weight, before and after performance measurements, and keep a complete history of all your runs.

Yes, we were among the suckers who endured the idiotic lines, activation woes and intermittent service that you've undoubtedly read about after the iPhone 3G's launch this past Friday. But our reason for suffering through myriad hassles to get our hands on Apple's newest hotness wasn't purely selfish. We wanted to see whether the iPhone 3G's new GPS functionality was worth the cost of admission or if we'd be better off buying one of the many stand-alone navigation units currently on the market. Make the jump to find out if it's worth your hard-earned cash and a place on your dash.

We've known for a while that the new iPhone 3G would have the magic of GPS, but we didn't fully realize how that power might benefit car owners. While we've seen a few semi-cool, car-centric applications available for the device -- from mpg calculators to maintenance reminders -- this program could prove the most useful for the forgetful among us.

After parking your car at a crowded shopping mall, users of G-Park tell their iPhone where their car is. When they wrap up their shopping, the application will provide directions back to the car.

The Internets are abuzz with the announcement of an all-new iPhone, and with features like 3G data connections, new applications and GPS navigation, we're excited too. If you've been making plans to produce your own navigation app for iPhone 2.0, however, you may not be all that thrilled. A closer look at the iPhone SDK agreement shows that creating software for "real-time route guidance" is forbidden. This may mean that the creative kids at Cupertino aren't going to let anyone compete with the the Google maps solution it's already settled on.

For those living under a rock, you'll be surprised to learn that Apple announced a new iPhone today that, along with 3G support for faster downloads, features GPS built into the popular phone. While current iPhones can pinpoint your location and provide a Google Map to a destination, they can't hold your hand while traveling and let you know when to turn. The new iPhone available July 11th will be able to do just that like GPS nav systems from well known manufacturers like TomTom or Garmin.

The iPhone has been a hit since its release and Apple has ratcheted up the excitement the last couple of months, as the recently-released software development kit for the phone is already bearing fruit. In a short period of time and on what we'd guess is a very limited budget, one group of developers has designed a cool racing game called Raging Thunder that features quality graphics, a number of cars, and steering that utilizes the iPhone's revolutionary accelerometer.