I found this cool program called SugarPlum that generates lots of random HTML and email addresses on the fly when you access it. Basically it's just catch spammers and add thousands of bogus addresses to their harvesters. Check it out. Cool thing is that it takes known spam bot user agent and automatically redirects them to the trap.

I did some testing at work, and found that if I did a recursive wget it downloaded well over 2000 webpages (before I cancelled it) and accumlated 12,000 email addresses. Pretty badass!