Hi BRL,
Have you checked for a trojan/keylogger on your machine? Other than that, you could just be lucky..
Most email addresses that are spammed will be either collected by bots, trojans or by programs generating addys randomly (it's not random in the truest sense, but you know what I mean). They will then send out the mail, and if the addy is good you get it, and they get paid. If not, it'll just bounce back and probably just deleted automatically. It wouldn't take long to generate any given 6/8/10 etc. alpha-numeric combination on a modern computer, and send it spam on the off chance that the addy exists.
Hope that helps.. but it would still be wise to check your machine over with your AV, *Adaware and any other tools you'd normally use.
Cheers
Liam
For those that don't know already, Adaware have released a new version of their software called
Adaware SE. (This is the official download link given on Lavasoft's site, just to save you a few minutes)
I'll post a sticky about the correct way to configure it in a few minutes.