Is it my imagination or is steam giving away left for dead for a limited time?

I checked "my games" list and left for dead was available as a download.

http://store.steampowered.com/app/500/

I thought I would notify it here in case anybody was interested in the game. I am downloading it now so that I can go on a ZOMBIE KILLING SPREE!

Wow. Its one of the best multiplayer games I have ever played. Its unreal.

I'm glad I've bought Left 4 Dead for half it's retail price. It's a nice game, but sadly too expensive for what you'll get. It's not exactly graphically or AI impressive either.

@Nitro: Yeah, the multiplayer coop is rather cool.