Audiosurf

[Parrot of Doom]

www.audio-surf.com

Free demo, or £5 to download the full game. Also on Steam.

If you like music and tetris, give it a go. You'll love it.

Seriously, give it 5 minutes.

[Timberwolf]

Been playing around with this since they released on the Friday, fantastic little toy it is too.

Songs you'd least expect to be turn out really good fun to play too, The Kinks' Starstruck is great fun, bouncing about all over the place.