Manage multiple Twitter accounts with your iPhone

Yelp serves up an alternative iPhone reality (video)
Augmented reality is fast becoming a reality for mobile search apps of all stripes. Get a taste of what's to come with Yelp's "Monocle" feature for iPhone in this First Look video.

Sneak peek at tasty new Zagat for iPhone 3.0
We got a sneak peek at Zagat 3.0 for iPhone, which will have augmented reality, an offline mode, and the capability to write reviews.

Yelp's iPhone app gets check-ins, friend stalking
Yelp adds a way for users to alert one another of their goings-on, though similar to Foursquare, the privacy implications may be a bit too much for some.

Smartphone touch-screen analysis tests finger fidelity
Moto Development Labs devises a simple method of comparing capacitive touch screens on the iPhone, HTC Droid Eris, Motorola Droid, and Nexus One.

AR.Drone helicopter controllable by iPhone
Coolest toy ever? This remote-control helicopter has a video camera that streams to your iPhone or iPod Touch.