Glad to see the idea of unique-per-site emails getting more traction.
www.abine.com Blur first did the same thing years ago (along with phone number & credit card number), but doesn't matter which one you use - just use something, be it Blur, Bulc or your own system.
The trickiest part is still explaining to others creating a private, self-describing, never-before-used email address, on-the-spot because the old static paradigm of email addresses is so difficult to shake.
Thanks for the feedback, stmw. Have you tried out the service?
Haven't yet, happy with Abine Blur, but the more the merrier...