Cauce.org

CAUCE.ORG is the Coalition Against Unsolicited Commercial Email.

CAUCE is one of the leading sources of anti-spam information on the internet.

CAUCE has sub-units based in India, Canada, Europe and Australia.

The website has tons information on the nature of spam, why it's a problem for end-users, and why spammers do it (hint - it has to do with money). They also have the status of various legal efforts to stop spam.

CAUCE does not have a lot of information on spam filtering or spam blocking software - which are the primary ways users can bring their own spam problem under control.

CAUCE also periodically debunks fraudulent claims made in specific current spamming campaigns. Recently they addressed the issue of bogus Tsunami relief spam.

Resource: Cauce.org