Post your aces free game recommendations here!
First up
http://www.spheresofchaos.com/Originally a RISC OS shareware game, Spheres of Chaos is Asteroids with added strobing, colour-cycling and power-ups. The author is working on a spanky new 3D version so has released the original as freeware, with Windows and Linux versions available for download.
Um, I probably haven't sold it very well, have I? It's dead good and stuff, honest.