GridWars - superb Geometry Wars clone

If you haven't heard of Geometry Wars - Retro Evolved, it's a new Xbox 360 Live Arcade game. Originally designed as an easter egg in Project Gotham Racing 3, it's quickly become an addictive hit. Best described as a cross between Asteroids and Robotron, the game is fast paced and full of eye candy. If you haven't been able to get your hands on a Xbox 360 yet, don't worry. A kind programmer by the name of Mark Incitti has coded an excellent knockoff called GridWars for the PC.