DylanMessaging: Viral Genius
This viral messaging campaign by Ten4 for SonyBMG's release of a collection of Bob Dylan's music last fall was enormously successful. I've always loved the original video, and harbored ideas of recording my own version of it at home to kick off various presentations I've given in the past, but hadn't pulled the trigger. Then I saw this (via Scott Kirsner -- thanks Scott!) and was really impressed. The mind races to all the other similar possibilities, though doubtless there are intellectual property issues that weren't a problem here.
Reminds me of another viral favorite, Mr. Picassohead