Twitter 360 is a cool iPhone 3GS app that visualizes your Twitter friends tweets located in your nearby environment. It uses the Augmented Reality functionality using the iPhone camera.
You can tweet with the application and view nearby tweets of your friends using the iPhone camera. For further tweets you can view them in Google Maps. More details in the video and the screen shots.
Pros & Cons
|Very simple interface|
|Provides different views for different distances (using iPhone cam for nearby tweets, or Google Maps for further tweets)|