mark gammon is one of the most influential tweeters here at CU. IMHO.
twitter.com/markgammon

I definitely agree with the previous poster on @andrewhyde. Also check out @zackshapiro, @sativabella, @bfeld, @pugofwar. I tweet about Boulder/CU quite a bit but also use twitter for angsty things like the usual teenager. Follow me if you'd like - @ickaickaicka