EcoFuture, Junk e-Mail - http://www.ecofuture.org/jmemail.html
Features comprehensive references and instructions to get off junk mail, junk e-mail, spam, and telemarketing lists.
Fight Spam on the Internet! - http://spam.abuse.net/
Features anti-junk mailfilters, IP blocking, blacklists, and other boycott tools to keep the net useful for everyone.