Steam is running a 2 offers ATM all you have to do is be an ATI/NVIDIA
gamer.
The games for Nvidia are half-life 2 deathmatch and lost coast,Peggle extreme
(?), and an 11 level demo for Portal
Link for Nvidia: http://www.steampowered.com/nvidia/
The games for Ati are Half-life 2 Deathmatch and lost coast
Link for ati: http://www.steampowered.com/ati_offer1a/index.html
Enjoy