Interesting and good idea. I had a couple of accounts in the Adobe breach, though I don't think I got an email from them (maybe it was spamfiltered or I changed my passwords before they sent those mails out), but I wish that there was some sort of long term service for responsible disclosure of breached accounts - eg you sign up, they make you verify your account, then they list and contact you whenever your email appears in some password list. If this one didn't show anyone my email addresses' status, and there was the ability to mark individual hacks as resolved this would fit the bill