So while going through the various Facebook and Twitter integrated clients (I still believe gravity is the best btw), I came across MobiTile. Its a flash application, and integrates Facebook, Twitter and LiveJournal. Signing in to facebook is a little cumbersome, you have to use your phone browser to grant the application offline access to facebook, but the twitter setup was instantaneous. I have not used livejournal, so I can not comment on the integration of it into the application. Do note that you need to have flashlite 2.0 or greater for the app to work.
One issue that I did have with the app (v0.3.0 – the application is still in beta), facebook refused to work after the first time I logged in, so that leaves us with Twitter.
The app has quite a few features; you can do the usual post, reply,ReTweet, etc, view user profiles, follow and block, etc.
All said and done, its got great potential, and you should try it – http://www.mobitile.com/