First off if you didn't know the WoW open beta has started. Go signup at worldofwarcraft.com it should last at least a week.

If you open the package contents on the WOW downloader you can pull the .torrent file out of it and load it into whatever BT client you want.

Just thought I'd post an FYI.

I realize this would be better in the Computers section but I've noticed most the mac threads there get no love.