Fluxiom has one of the nicest demo videos I've ever seen. It looks like it might do just about anything. I'm not sure what it is, but I think I might want to use it.
Apparently it's developed in rails, which makes it just that little bit cooler still.
There is a lot of noise happening around enterprise content management and web 2.0 at the moment - It's going to be interesting to see how these young new whippersnapper guys are going to compete with the established big ECM players.