Junk mail tracking website

Back in the old days, when the internet was still powered by steam, I relied for CD recommendations on a website called firefly.com (Don't look for it, it's not there any more). Users of this site would enter a selection of CDs they owned, and the site, using a more sophisticated version of the (Most people who have Brian Eno's "My Life In The Bush of Ghosts" also have The Penguin Cafe Orchestra's "Another Green World") argument would then recommend some CDs you might like. It really was very good, and once I had entered about 20 CDs, recommended a whole slew of CDs I already had, but hadn't entered. I believe the technology was sold to Amazon for their book recommending thing, and the domain is now owned by Microsoft.

Anyway, this idea is to apply the same technology to junk mail, of which I receive a lot. Junk mail is sent to addresses based on which address lists have been bought by the junk mailer, whether your address is in an affluent area or not, which competitions you have entered recently, etc.
I envisage a web site where you can enter your postcode/ZIPcode, details of who you bank with, which credit cards you have, which organisations you belong to, which catalogues you have signed up for, etc. (but obviously not your name, address, bank account number, etc., for security reasons) and which junk mail items you regularly receive. The web site will then be able to do two things. Firstly, it will predict which items of junk mail you are likely to receive in the future. Secondly it will be able to correlate member details with junk mail (e.g. "Everyone who holds a VISA card, but not those who hold only Mastercards will receive a letter every six months encouraging them to buy a Bose Wave Radio").
The other service this site might offer is to show you what junk mail you're missing out on and, if it's something you want, what you need to do to get it ("To get on the mailing list of this lingerie catalogue, enter any competition in Pretentious French Cinema magazine").