The Cliq has Motoblur, which puts Facebook, Twitter, MySpace, etc. in one app that constantly updates. It's pretty awesome.
NewsRob is free, it works pulls your feeds from Google Reader.
Facebook Touch is basically the web-based touch client in its own application. It's all I use. I'll use Twidroid from time to time, only because it updates almost immediately, whereas Motoblur takes a few minutes. I'm impatient.