Will Solve Captcha for Money?

alx_lo writes "Captchas are a nice idea to protect your blog or guestbook from being spammed by robots. But what good is this protection when you can hire "data entry specialists" to solve captchas for $0.60 per hour for 50 hours a week? Anyone here who can think up a solution that does not include drastically changing the global economy? How about captchas that require cultural background knowledge to solve?"