I'm also on Twitter, and I've been enjoying myself a lot. You can find me, if you're so predisposed to do, here:
http://www.twitter.com/mitchman3.
Also, my favorite Twitter programs are TwitterFox, which I use on Firefox 3 to help me track what's going on, and Tweet My Blog, which I've seen some other people mention. However, I only use it to post my latest blog entries to Twitter; I turned off the running commentary showing on my blog.