Activision

Computer Games Online

CNET Gamecenter

Demo Land

Download.com Games

Game Escapes

Gamelan

GamePen

Games Demo Depot

Games Online

Games Spot

IDG Games Network

Konami Games

Microsoft Games

PC Games

Sega

ShockRave Games

ShockZone Arcade

Space Pirate
(very cool - requires Shockwave plugin)

Star Wars

The Applet Arcade

The Gaming Planet

Yahoo Games