A long while ago I signed up to try out emusic.com as it seemed like someone doing the right thing with non-DRMed music files. Their business model didn't really suit me, what with it being subscription-based and quite expensive.
As usual, I gave them a sneakemail email address, in case they are spammers. Well it turns out they are, or at least they're happy to give out your email address to any number of dodgy fuckers. Sascha Welter details it. Technically they're only doing what their privacy policy allows. Great way to piss off your customer though guys!