Take a look at Google Wave. My gist is it’s a conglomerate of existing apps and tech to really bring together collaborative work.
Wiki was a real step up but it looks like google wave’s ideas are the next level. Putting “wiki” and “google wave” in the same thought is doing it an injustice. It really is a hyper-active, hybrid of all the disparate apps you use right now.
Anyway, it looks interesting and it could be game-changing.
There’s a video out there that is very long. But here’s an abridged version: