site that pays you to plame a game?

I don't personally know of any sites that pay you cash to play games, but I do know of a couple of sites that you are able to earn points on that can go toward prizes (like Amazon gift cards). The two sites that are allowing me to do this right now are Swagbucks (games are still in beta though) and Winster, which I've been a member of longer than I've been a member on mylot. I use the points that I earn in order to do my Christmas shopping.