The jupiter icon is Celestia, which is really neat, but I almost never actually open it (like I said, I really need to clean out my dock).
For some reason, the icons in your dock and what I can see of the background suggest a very earthy/nature-ish theme. I'd be interested to see what your desktop picture is.
EDIT: What programs are you all using to modify your dock colors?
Thanks for the tip, that looks pretty cool, i'll have to show my astronomy teacher (also a mac user)
as for my background, I guess you could call it kind of nature-ish: Underwater City. It has kind of a Samurai Jack feel to it, plus I love vector art. Vector art just looks better on a mac than most other backgrounds, at least for me. This is the one I was using when I took the Dock pic.
I also sometimes switch it to this: Monkey Sillouttes, because I'm a anthro/primatology major, and i love primates.
Sometimes i use this: The Deep, because 20,000 Leagues Under the Sea is one of my favorite books.
Lastly I often use this: Mars, cause its beautiful and far away.
I actually have a huge library of wallpapers, but as much as I like the ones I have in my library, These are the only four I ever seem to use.