Check out the Torture a Spammer Game from MarketingSherpa. It's not blog spammers, but rather e-mail spammers, with whom "legitimate" email marketers have a big problem with, apparently. I'm of two minds about the game - I think it's a great idea, but it's poorly executed in my opinion. All you do is click on icons of spam while not clicking on icons of angelic "opt-in" emails - seems like they know their audience.

It's worth seeing, though. I imagine that every site could make a game like this where you foil your customers' natural nemesis and gain, in the end, a way to opt-in to some marketing email list...