See it in action here.
I love twitter, but I just couldn't find a twitter client for my PPC that I liked. So I had some spare time wrote my own. It's pretty full featured -- it lets you see your timeline, replies, other users info, etc. It even integrates with twitpic so you can snap a picture for your status, and search.twitter.com so you can see what everyone's got to say about the latest news.
If you're using a touchscreen, it has a unique kinetic interface, so it's kind of fun to scroll up and down and view the menus on the sides. If not, it's still easy and functional
I'm still actively updating it, with about a release per day. It includes an auto-upgrade feature so it can check for the latest version and upgrade itself.
If you're a twitter user, you can try get my client from
the google code site. Let me know if you have anything to say about it. You can contact me and see the latest developments at
http://twitter.com/PockeTwitDev.