This is very cool.  I've just touched the surface, but after visiting the 
www.thejohnnycashproject.com site, within minutes I'd made a drawing based on a photograph of Johnny Cash, registered for the site and submitted my drawing.
Then I tweeted, blogged and flickered about it.
First seen 
here.
Whoa! Everyone's images are assembled into 
an everchanging music video.
You can also watch a playback of people's drawing sessions.