I have an old site, using a plain contact form. On Monday i'd had 20 viagra emails all from randomly named gmail accounts. This morning I had over 100, with more arriving every 2 minutes or so. I added a basic turing test and it stopped immediately, so it's definitely bots at fault.

The thing is, it's become easy for the spammers to get their hands on gmail accounts. I've heard they are even using cheap labour just to beat the captchas on some email account signups, and the AI captcha progs are getting increasingly more sophisticated.

So it looks like capchas are dead - are turing (human intelligence) tests going to be a foolproof way to beat the spambots?