The database contains full addresses, names. You can easily find who is cohabiting with them fairly reliably (near 100% if they live in a house) through a variety of services which list that information.

All I can say is there's going to be a hell of a lot of blackmail. I'm sure there's already a group on IRC organizing blackmail. There's a lot of targets and it's very information rich.

Well Mr. Ashcroft you're right, it really isn't that hard to figure out who people are.