Ben Keating sent me a link to this nifty IBM project called History Flow for tracking community edited documents on line life. My bet is that time-line projects like this are going to become more commonplace in the web 2.0 world.

history flow is a tool for visualizing dynamic, evolving documents and the interactions of multiple collaborating authors. In its current implementation, history flow is being used to visualize the evolutionary history of wiki* pages on Wikipedia.