OStatic

If you're in the market for a lightweight, open source microblogging client for the desktop, have a look at Spaz. It's a slick cross-platform app that uses Adobe Air to update your status on Twitter, Identi.ca, and Laconi.ca.

Spaz supports multiple themes, event sounds, and user-defined CSS overrides. You can delete updates you've already sent, Favorite your friends' Tweets, and send direct messages or replies to other users. Spaz keeps track of who you follow as well as who follows you, and auto-refreshes to keep you on top of all incoming direct or timeline messages.