This one is abandoned by its author. And now starting to become useless, after twitter changed how they display retweets (if you add comments), basicly you get the comment and then a link to the tweet.

Rainbowstream looks good, works well as far as I tested, but leaves a bit to be desired in the way you interact with it. Being able to just type to tweet in ttytter was nice, with all commands starting with a slash - a bit like IRC.

Rainbowstream's "conversation" command is way too long. I use ttytter's /th command quite a lot, very short.