- You should check out GameTap. It is pretty sweet.
- Right now they have a 2 week free trial which gives you unlimted downloads and playtime of their games, of which there are over 500 so far.
- And these are decent games too, such as:

Galaga
Sonic & Knuckles
Tom Clancy's Splinter Cell series
Street Fighter Alpha 3
Virtua Fighter 2
Virtua Racing Deluxe
Tom Clancy's Rainbow Six series
Tomb Raider series including The Angel of Darkness

- Even better, there is no commitment. So signup, play the games and quit if you don't like it!