Add a link to this page to your sites so the bots will pick it up when scanning for email addresses.
Copy and paste the following link:
<a href="http://www.livio.net/main/mailto.asp">Beat Spam</a>
This will put an unbelievable amount of bad addresses into the spammers databases, increasing their bounce backs and making thier lists unmarketable.
The addresses listed here are randomly generated and will change each time the page is loaded.
Also, the link at the bottom points back to this page so their bots will be stuck in an infinite loop constantly creating new addresses.