Subspace Continuum!
http://www.download.com/3000-7467-10435908.html
It's a free online game where you fly around in your little 2D spaceship with hundreds of other human players and blow the living snot out of eachother! xD
Make sure you come prepared to die ^_^
If anyone actually bothers to try it, I would highly recomend starting in the "Extreme Games" zone. It's where I play wink
