Exploiting spammers to make computers smarter (glinden.blogspot.com)

It's a lot harder to take this stance if your site is impacted by the arms race, but it is cheery news for the technologist inside us all.

One caveat is that this sort of development seems more likely to remain in the darknet.

Someone should implement a CAPTCHA system that simply presents the user with random HITS from Mechanical Turk (perhaps not all of them are suitable though) and collects the profit.