2 FREE games that Rock
Savage - (FPS/RTS) or RTSS (Real Time Strategy Shooter) - Online Multiplayer
Note: For no prior installation download "Standalone"
http://www.notforidiots.com/SFE/
TrackMania Nations Forever - (Racer) - Online Multiplayer, and Single Player
http://www.ausgamers.com/files/details/html/35183