Thanks a lot, everybody, for such great answers.
I even understand most of it after I read them.
TheThorn and rahuldandekar: Thanks for the links. I will definitly check them out when I get home from work.

But then I got another question for Sp1ke: How can the universe expand faster than c when nothing else can travel faster than c? Isn't the expansion of the universe just "everything" moving away from each other?

Again, thanks for great and simple answers.