OK, so I'm a big Digg fan.
The amazing user tools that Kevin Rose unveiled in a Diggnation podcast are live and you've gotta check them out. As more and more data flows in our lives, a way to few the live interactivity will be essential. This implementation is amazing to watch and even though I can't completely understand everything that's happening there (a more detailed guide would be nice) I can't seem to stop watching. http://labs.digg.com/ Check out both the stack and swarm formats, click and drag and sit back and watch. There's something there. I can't put my finger on it, but it is cool.