Twittervision is combines Tweets and geo coding to show a realtime display of what people are Twittering. It’s quite a beautiful thing to watch, especially the 3D view.
I guess I wasn’t aware that Twitter fed all updates to third parties, so that’s something important to be aware of – it’s not just your followers who are seeing your updates.
I’m not sure it’s actually useful, but it certainly is neat, so probably it is useful to somebody.
I wonder if Twitter will be coming up with a trademark licensing program to allow apps like this to live peacefully.