A site that offers people free ingame gold on most of the popular MMORPGs. Only 2 referrals needed and the offers are generally a lot easier than other incentives sites. I just made an eBay account and didn't even need a credit card.
FreeGameGold.com - gogogogogo.
It's really new and unheard of, but it's a good idea and it seems people actually have a better than even chance of winning. So spread the link about a bit.
