I think that Google Wave looks fantastic, and I requested an invite with this message that you might find interesting:

I am an open source developer very active in the video editing space. I am interested in exploring how wave and its protocols can be used for collaborative video editing. I am thinking about not just professional usage, but casual sharing that naturally morphs into a more composed and published result. Imagine some family, club, sporting, or business event where afterward people share feedback and their media resources and then some continue on to participate in a mashup-like process to chronicle the event.