Blizzard just announced this new World of Warcraft program called Recruit a Friend. Whenever you convince a friend of yours to throw away his or her life for 30 days (and they’re paying for those 30 days), you get a free 30 days credit to your account. If you convince him or her to pay for 60 days, you get a mount, the Zherva. It looks like a zebra!
Perhaps even better, when you and your friend are grouped together, you both get triple experience.
Blizzard knows how to bring you back into the fold.