Then there's this Asirra thing. Did anybody from the Times actually try it? Here's an unscalled image of what it looks like:
Now, you can hover over an image for a larger version. But now to solve one of these CAPTCHAs, you've got to hover over 12 images, and make a decision on each. Asirra is undeniably cute, but it's not clear that it's all that much easier than the current, well designed, CAPTCHAs. The security of Asirra is also unclear. It'd be interesting to see what happens if Asirra is ever put in front of a high value target (something that can be used to send email, host pagerank-gaining links, or host porn/warez). I have a feeling that some spammer would find a way to abuse a botnet and take advantage of some of the design issues in Asirra.