I use Shareaza, but I don't recommend it. It's crap, but I have my reasons
I tried Azureus, but it crashes my firewall for some reason and I just don't feel like trying to figure out why right now. You should be able to get Azureus running though. See if there's a forum somewhere on the net for it. I'm sure your problem isn't unique.
A friend of mine swears by BitComet, if you're looking for something else to try. I'm sure other people here can give some good alternatives too, but from what I've read all over, Azureus is supposed to be about the best.
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