Having spent a large number of hours on this and having done an exam essay on it, i reckon i can have a fair crack at this one.
OK, there are random events occuring in the universe, and so cause and effect can be ruled out as a form of determinism. However even if random events do not occur, then free will is still available, its just it would be possible to predict what choice you will make. I dont believe that this would mean we do not have free will, just that if put in exactly the same position twice, including in terms of experience (some sort of time travelling amnesiac i suppose) we would make the same choice, purely because based on the evidence and our current physiological state, that choice is still the best one. But i know where your coming from Cynic, thats why i asked a few physicists if random events do occur.
Genetically we are only semi-determined, and also by our environment. So although our choices are limit by our situation, we still have choice. I also agree with Mr. Jack, since i dont believe in any form of spirit or soul, then i am my brain, and so choices are made by me.
Something that always interests me is people who believe in God, or some other omnipotent, omniscient, omnipresent diety. Because in theory then if something all powerful it must know the future (mainly cos a lot of people i know wouldnt consider something all powerful if it couldnt) if the future is known, then we have no choice. Then if u start seriously considering this route philosophically Judas is something of a saint, to take so much stick about how he was a traitor, whereas in actual fact he would have had no choice in his actions... just something to ponder
Unseul
Give a man a fire and he's warm for a day. Set a man on fire and he's warm for the rest of his life....