Any webmasters here participate in Project HoneyPot? It's an easy way to help fight spam globally. You can install a HoneyPot script on your site and/or donate an MX record for them to use for spam testing. I won't get into all the details, you can simply check out the site for that.
http://www.projecthoneypot.org?rf=210696
(yeah, yeah, that's a "referral" link but I don't get anything for it but an extra tick next to my name, it doesn't mean anything - you can take off the ?rf=210696 if it really bugs you)
PS not advertising, this is all free and I get nothing for it - just looking to see who else may use this, and maybe get others involved for the greater good.