Valve's Steam service just release a new update to its client software today. The update has a number of additions for users of Valve's game download service including a way to purchase games via the Steam web site rather than just using the Steam client. There's also new backend support for matchmaking for the upcoming release of Left 4 Dead and for Steam Cloud.

But in a surprise move, Valve has also announced that to celebrate the release of the new Steam client they are putting the acclaimed music-racing game Audiosurf on sale for just $2.49. That's 75 percent off its usual price of $9.99. The reduction is for one week only so if you haven't tried this terrific game you will likely not see a price as small as this to grab it.