I enjoy Socialite. It appears more snappy and pretty stable than EventBox was for me. It's my default RSS reader (syncing via Google), and Facebook. I tried to keep Twitter in there, but Tweetie is just too damn awesome.
There were a few hiccups when Google changed their synchronization, but that's been resolved, and it's been working great for me. The guys at RealMacSoftware make some great stuff, so I'd pick up a copy.
Part of team Orange!