Tweetree - Birds in a tree.

Tweetree - Birds in a tree.:
"Tweetree puts your Twitter stream in a tree so you can see the posts people are replying to in context. It also pulls in lots of external content like twitpic photos, youtube videos and more, so that you can see them right in your stream without having to click through every link your friends post. See what twitterers are saying about us!"