I've *heard* that you can share games up to 5 times, however, I don't know if this will work the same way with expansions.
BTW: Awesome DM on saturday, and my apologies to whomever I teamkilled. ;)
We'll miss you George.
PSN:Puzzleface
XBL:XpuzzlefaceX
My friends call me Hadoken because I'm down-right fierce