While this sounds like a neat idea, it's sort of annoying that people keep posting sites that don't do anything. I don't want to sign up for a newsletter and be notified/spammed later. I want to mess with it now. That's why I clicked on the link. This seems to be super common on HN these days and it drives me up a wall. I get excited by something in the headline and get let down by the lack of content. Am I alone in this? Why do people keep doing it?