Hot Captcha

Excellent!

Its becoming more and more difficult to figure out if a browser is really human, or some programmed entity designed to get through authentication mechanisms and post SPAM everywhere.

http://hotcaptcha.com/ have come up with a way.
You are presented with 9 pictures of people from http://www.hotornot.com/, and you must select 3 “hot” people to prove that you’re human.

From: http://blog.moybella.net/2007/03/26/hot-captcha/