Very clever and original spin on the craze. I tried NewYorker.com and the butterfly (of the Eustace Tilley logo) was the first to shake... Seemed fitting.
This is awesome. Worked really well on several sites. The only thing that'd make it better is if, at the end of the song, it faded to black and put up a YouTube-style "Replay" button in the center, just like the videos.
This is an perfect example on how not to do url validation. I tried it on http://hs.fi (Helsingin sanomat, Finnish news magazine) but the site says it is an invalid URL.