Really, really, really cool. Site looks slick. I would definitely use this if there were more users (the old chicken and egg problem ...). My suggestion is not

Really, really, really cool. Site looks slick. I would definitely use this if there were more users (the old chicken and egg problem ...). My suggestion is not to restrict it based on email but to have a very very strong voting policy (i.e. HN). If you say something dumb on HN you get downvoted into oblivion, and that is OK.