This evening I decided to try playing around with Twitter. I'm not terribly sure what I think about it right now, but I'll use it for a week and see what conclusions I draw.
For the moment at least, you can check out my Twitter Feed to see what I'm up to. While I cannot guarantee that I'll remember to update it, I can, at least, guarantee that it will be reasonably boring =).
Without knowing much about Twitter as it stands right now, I can still recommend Twitterrific which seems to be a pretty polished OS X Twitter client application.