Here are some other pages where you can learn more about these issues.
- spam.abuse.net, a.k.a. "Fight Spam on the Internet!"
- CAUCE, the Coalition Against Unsolicited Commercial Email.
- The Spamhaus project - if you must use a DNS-RBL, these folks are probably the one to use.
- The SpamCon Foundation.
- SpamLaws.com, current and proposed anti-spam laws compiled by David Sorkin.