StarDestroyer.Net BBS

A free solar system and star simulator. Fun to just fly around at AU per second.
Extremely taxing though. My 256 mgs couldn't handle going to the dropdown menu, but otherwise it preformed flawlessly.
It syncs with your computer so what you see is a simulation of the current placement of the planets and their satellites.
http://www.shatters.net/celestia/

This is pretty sweet. I'll be playing with this for about the next 6 months...

Already have it running on Linux. Anyway, doesn't tax the hardware too much unless you enable everything simultaneously. Too bad nebulas aren't included by default, and it doesn't crash spacecraft after thousands of years.