I'm with Jack, except that I wouldn't say the universe if necessarily deterministic. I think its very hard to really figure out what "free will" even means. As far as I can tell, there are only two ways things can occur: Either they are determined or random.
Say John makes a decision. What caused him to go one way over the other? X did. What caused X. Y did. etc. Eventually its going to come down to an infinite regress of causes or a random event somewhere.
[This message has been edited by JustinCy, 04-23-2004]