Revisit is was a real-time visualization of the latest twitter messages (tweets) around a specific topic. In contrast to other twitterwalls, it provides a sense of the temporal dynamics in the twitter stream, and emphasizes the conversational threads established by retweets and @replies.

Currently revisit is down, due to changes in the twitter API which would require some serious re-engineering. (Learn more)

You can find more info about the project here, and here is how it used to look:

revisit see5 from Moritz Stefaner on Vimeo.