The Blacklist of Internet Advertisers
A site taking a proactive approach to curb inappropriate advertising on usenet newsgroups and via junk e-mail.

CAUCE
The Coalition Against Unsolicited Commercial Email

Consultwebs.com Articles on Spam Prevention, Blocking & Rerouting

Earthlink
Spam prevention tips from Earthlink.

Fight Spam on the Internet!
A very useful California based anti-spam website loaded with useful information.

The Mail Abuse System LLC
A nonprofit California organization whose mission is to defend the Internet’s e-mail system from abuse by spammers.

The MAPS Realtime Blackhole List
A method of reporting networks that are slow or unresponsive to your requests for assistance in bringing down spammers.

SpamCop
Abuse addresses & IPs guilty of spamming.

Spam and Junk Email: Against the Onslaught
Useful advice and explanations of how to avoid spam email messages.