Having never received a single piece of spam in my computing life, I think that I may finally started to realize why.
I NEVER give out my real e-mail address unless it's to a company I trust, for example Barnes & Noble. Secondly, I read privacy statements extremely carefully before I ever agree to anything. Whether it's to give them the option of e-mail notification, or software registration, or whatever.
Other than that, I cannot figure out what I do differently than the rest of the computing world.
I have received bogue e-mails from my yahoo account that I created here a few times a couple of years ago, but that's about it. And I simply blocked all of those and never had that problem again.
I'll also get the occassional scam e-mail like we were talking about on Frank M's thread. But I'm pretty sure that has to do with my father who gets a virus on his machine about twice a year.

Probably gets my addy from his addy book.
Stoner, have you tried blocking these accounts?