Infinity is a space MMO, developed by a very small team (with only one guy doing the main coding), with the help of the community. It plans (as my title states) to have more then 200 billion stars, just like the in the real milky way. Best part? It's all procedurally generated (think spore creatures), so every planet, while being being different form all others, only needs a seed (several bytes worth of data). There's even a combat prototype out. It's only a sort of space-team-death-match in a sort of arena, and the planets and stars are just there for show, but it looks very promising. They plan to have an alpha sometimes next year.
Oh, and did I mention everything is to scale? Meaning planets really ARE huge, and you can actually go everywhere without loading screens? Yeah.
Video for the transition from the planet to an asteroid ring as well as the physics engine,
here. The real interesting part starts at about 3/4 of the way through.
I'm psyched. This has awesome potential. Apparently there won't be level, classes, or skills, either... combat is twitch-based.