Just found this today:
http://www.youtube.com/watch?v=CjQUhIWNfqw&feature=channelIt's pretty fun, the only problem is that it's pretty hard to aim from a ship at something far away, especially with missiles. There's a multiplayer mode too, so there's a lot of fun to be had there as well. The video explains basically everything about it, and it can be downloaded
here
