Gwibber is an open source microblogging framework and desktop client for GNOME. You can find it in your package manager for most major distributions. Currently it supports Twitter, Identi.ca, FriendFeed, Facebook, Jaiku, Digg, Flickr, BrightKite, Qaiku, and OpenCollaboration. Word is when Google opens the Buzz API that Gwibber will include support for Buzz too.In Ubuntu, I love that I can minimize Gwibber down to the tray on close and see bubbles with the latest updates. Being able to manage multiple Twitter accounts plus Facebook, identi.ca etc. is really convenient as well. I added Gwibber to my startup applications list so I don't even have to launch it, it's there as soon as I login to my computer. I hear you can install it on the Nokia N800, N810 and N900 too if you're willing to do some tinkering, not sure I have time for that one at the moment.
Gwibber has replaced all my other social networking clients, I just hope the Buzz support happens. Check it out, should be in your package manager.
http://live.gnome.org/Gwibber
http://twitter.com/gwibber
http://identi.ca/gwibber
