Blackbird is a client that brings the world of Twitter to your Blackberry.

Blackbird is a compact, simple application that lets you keep track of your friends and your updates.

The application is free to use.

Grab it at http://dossy.org/twitter/blackbird/

GPS Twit is a nifty application for the iPhone that makes it easy for your friends to find you. No more wandering around wondering where on earth Jimmy got to!

GPS Twit answers the question. Where are you and what are you doing?

Visit the GPS Twit webpage at http://gpstwit.com/

Twitter for iPhone takes the Twitter experience and crunches it down to pocket size.

It’s a miniature version of Twitter that lets you do everything you would do via the full sized Twitter, including easily checking updates, reading profiles and adding friends.

Check out Twitter for iPhone at http://twitterforiphone.com/