Saw over on Shacknews that AudioSurf is on sale via Steam this week for $2.49. That's cheap. That's, like, completely ridiculous. AudioSurf is easily worth four times that much, which is what it normally sells for. That is a steal, people.
If you don't currently own AudioSurf, you should. It's a cool music-themed game that lets you import your own MP3s. The game then generates levels based on your music.
Apparently the sale is due to the latest addition to the Steam service... a shopping cart. Now you can buy multiple games from Steam without having to enter your credit card each time you buy. That means you could also buy a hot game like World of Goo at the same time, if that's your thing. Shopping carts! The future of Internet commerce is here!