I've been pretty free about spreading my email address around, deciding that since my email address is already on spammers lists, hiding it now would be like trying to stuff the genie back in the bottle. When I see people list email addresses as 'hello at fury dot com' and such, I wonder how well that kind of obfuscation thwarts email harvesting spiders.

The Center for Democracy & Technology knows where spam comes from. This article is the most insightful look into how the online world works that I've seen this year. It's truly fascinating reading.