Did you ever want to be the guy/girl in the white hat, fighting the bad guys and making the world safe for democracy? If you have a web site, you, too, can be a hero by participating in Project Honey Pot to help rid the world of spam.
Here's how it works. You sign up for an account with Project Honey Pot, and they issue you a dummy email address. You include this email address on your site. (Of course, you don't use this email address for any correspondence.) When the spam starts rolling in as a result of email harvesting by spammers, Project Honey Pot collects it, and reports the spammers to the authorities.