Neat idea - Grafitter is a way collecting information about your self over time while sending updates with Twitter, using IM, saving bookmarks on Delicious, and writing a post on Blogger. Grafitter visualizes the information you record in graphs.
Revisit is a real-time visualization of the latest twitter messages (tweets) around a specific topic. Use it create your own twitter wall at a conference or an ambient display at your company or whatever other idea you come up with. In contrast to other twitterwalls, it provides a sense of the temporal dynamics in the twitter stream, and emphasizes the conversational threads
Eric Fischer maps language communities on Twitter using Chrome's open-source language detector. Each color, chosen to make differences more visibly obvious, represents a language. English is represented in dark gray, which is used just about everywhere, so it doesn't obscure everything else.