 If you could 'reinvent' anything what would it be?
tolmasky: Addresses. They should work just like cell phone numbers, if I get a new cell phone the old number still works. I should similarly have an address "number" (which is mapped to a physical location by the post office). That way, when I move, I don't need to contact every magazine I subscribe to, every friend I have, every bill I pay, EVERYONE. People could continue sending their mail to my "number" and it would still get to my new place.