Captchas and Online Games

This is a pretty long video (50 some minutes), but it's worth the time to watch. It discusses these issues, and more.

• What is a Captcha, and why is it not the ultimate protection against automated attacks?
• Why do I see a Captcha sometimes, when I'm looking at pictures?
• Why are there so many free online games?
• How does Google Images get their pictures labeled so accurately?
• How do hackers and spammers setup multiple online accounts, using scripts, even with Captchas required by the online accounts?

Captchas and Online Games: Human Computation (Luis Von Ahn: July 26, 2006)

And here's a later story. The New Scientist: CAPTCHAs conquered?, or my mirror if the New Scientist web site is still slow responding. And an additional opinion: brains-N-brawn.

Having seen the video, and read the additional stories, answer the poll.