I have one email and one only that I use to signup for sponsors' programs and that is the email addy I get the most spam on.
I don't submit to linklists too often, but when I do it's with a different email address that *doesn't* receive much spam.
I never waste enough time with it trying to pinpoint who is doing it, but it does suck ass. There are so many big programs with lackeys working for them that get access to so much of our information that you never know what they're doing with it to turn a trick or two on their own time.