GameFly: Offers unlimited video game rentals for PlayStation 2, Xbox, and GameCube. Service includes free trial and free delivery.
GPlay.com: Rent an unlimited amount of Xbox, Playstation 2, and GameCube video games. Service includes a free trial.
Movie Game Rentals: Offering monthly rental of titles for XBox, PS2, PS1, GameCube. Also offers packages including DVD rental as well.
NumbThumb Games: Online video game rentals for the Playstation 2, GameCube and Xbox.
RedOctane: Online video game rental.