There was a posting on http://slashdot.org this morning that pointed to a
report on Spam that was quite interesting.

Why Am I Getting All This Spam?
Unsolicited Commercial E-mail Research Six Month Report
http://www.cdt.org/speech/spam/030319spamreport.shtml

The Macintosh has a utility for encoding email addresses on the web as
talked about in the article. See
http://www.railheaddesign.com/pages/software.html and check out
“SpamStopper”