All I can say is that this is the only site that I've used my work adress to register for, and all of a sudden I'm getting spam there. No one else at work is getting the volume of spam that I'm getting either.
Fortunately, your site lets the email address be modified, so I switched it to my AOL email address which is a valid email address, but which I have closed it to all incoming mail. Still didn't solve the problem, as I think the harvested email addresses went out in the vast world of freely available addresses available to spammers.
Oh, I wouldn't mind the car stuff, but I'm getting viagra, enlarge your male appendage and HGH spam (I'm female so this is relavent???), as well as mortgage info, prescription and consolidate debt spam.