Honestly Celestia+ (whatever is it called) is better than the original, but still good.I've never heard of Celestia+ either. If you need help setting up Orbiter just ask me. It can be pretty complicated to set up.
I'll take a look at Orbiter.
I love Orbiter! ;D
Also, I very much like to use Stellarium to see what's in the sky and when. It's an observation program.
There's also a little aplication named... Gravity. It's an N-Body simulation, where you can choose the amount of galaxies, and it puts them on courses near each other.
Here's a look at Gravity:
(http://dl.dropbox.com/u/1649320/holygravitybatman3.gif)
I figured since this is a space related forum that I would let people here know about Orbiter. I'm sorry if somebody thinks I'm advertising, but I'm not.
Thanks.
And yes, it was originally freeware, just in case this causes some confusion.Download this incredible piece of time wastery (http://dl.dropbox.com/u/1649320/Gravity/Gravity1.55.zip)