For some reason, Spammers love my e-mail address. I'm guessing it's one of my posts to Usenet where they have harvested my particular address. I've been looking into Greylisting recently to help combat the situation, specifically Postgrey (I use the Postfix MTA).
Since setting this up, I have yet to receive an unsolicited message! That's a big difference considering I was getting around 50 junk messages a day beforehand. Installation was very simple under Debian as it has already been packaged, so you just need to apt-get it and add a check_policy_service line to your smtpd_recipient_restrictions in main.cf.