An executive at Microsoft has an unusual idea for beating spammers. Powerful software tools and supercomputers aren’t involved, but kittens are. Or rather, photos of kittens. Kevin Larson, a researcher at Microsoft’s advanced reading technologies group, has found that asking a user to identify the subject of a photo, like a kitten, could help block spam programs.
http://www.infoworld.com/article/07/08/03/Kittens-could-solve-spam_1.html
http://www.pcworld.com/article/id,135526-c,spam/article.html