this is pretty sweet being able to run big games, there's no monthly fees? thought there was
Onlive is free like Steam, and the games are one payment. However, they have a monthly deal where you get 50-60 games (and growing) for $10 a month.
EDIT: Actually it's 60+ games and games are added regularly. It even has games like Just Cause 2, FEAR 2, Borderlands, Deus Ex, Bioshock, Homefront Multiplayer, and Hitman etc.