There has been 3 fairly notable demos released while I've been gone, so here they are!

Galactic Dream: Rage of War, has had version 1.2 of it's demo released, and is described like this "Galactic Dream is a classic real-time strategy game with resource collection, base building, massive battles and pure destruction. The game features a Single Player campaign with varying objectives, from simple 'kill all enemies' to timed defenses, destroying or protecting certain targets to escort missions."

Space Seige, the space action/RPG has a demo avaliable too.

Time of War: "A modern day shooter featuring addictive old school gameplay, Time of War brings back the mindless fun of battling huge hordes of enemies, shooting big weapons and blowing everything up in ground shaking explosions."