Spotted this link over at Critical Hits, and they’re right, you really should check out this cool game.  It’s like a puzzle game with a stream of ‘stuff’ you have to re-direct to fill up meters, but as you do so they play sound and as the levels get more complex so does the music.

You need your speakers on, really, it’s cool.  Play’s fullscreen, so probably not something you can get away with at work.