You need the Google Chrome browser but this interactive music vid by Arcade Fire is very cool:
http://ping.fm/PEhNK

Mashable have Justin Bieber slowed down 800% - an ambiant trance improvement:
http://mashable.com/2010/08/17/slowed-down-justin-bieber-song/

Mmm 103 year whiskey, nom nom nom:
http://ping.fm/tsR6G

has untangled the mystery of the Apple Magic Mouse in Windows 7