collaboration on art via the internet has been going on since day one ?
anything that can be digitised is easy to send backwards and forwards between different people... i was sharing samples with people all over the place 15 years ago and many popular music albums are recorded by different musicians around the world just adding their track to the multitrack.
music, pictures and documents (books and screenplays) , movies .. are the obvious and already happening ones.. realtime is even possible if you have fast links and the right software.
its been exciting for ages!
--edit--
hope i didnt come across too rude, i cant watch video here and couldnt really grok the "new" thing this guy was doing from the text available and for some reason the self promotion style of it always brings out the cynic in me
on some levels , this site is a shared artform itself... combatively collaborative cranky cooks