Redirect Mailto: For Spam Prevention
Prevent e-mail siphons from harvesting your e-mail addresses by separating the address from the Web page while still providing a way for users to click a link and have it open their local mailer. Examples in Perl, OpenACS, PHP, and ColdFusion.
http://jamesthornton.com/software/redirect-mailto.html

Valsir S.p.A.
HDPE waste pipes and fittings, flush cisterns, multi-layer pipes, soundproof pipes, traps and siphons for flush and waste systems.
http://www.valsir.it/

Graphic @ for Spam Prevention
Prevent e-mail siphons from harvesting your e-mail address by not using the commercial "@" character when displaying your e-mail address on a Web page; use a graphical "@" instead. Examples in Perl, OpenACS, PHP, and ColdFusion.
http://jamesthornton.com/software/graphic@.html