It's a bit like a realtime version of Honesty Box. For those that don't know, Honesty Box is a Facebook application that allows your friends to give you anonymous feedback.
Overall, the site design is simple and to the point. I like it.
But, if you wanted to make a really interesting contribution to HN, I'd like to see a follow-up blog post going into minute detail on how your application spread.
Lots of people write about how their app has 'gone viral', but very few actually talk about their initial user pool, how they tweaked their application for broader appeal or faster spread, etc. You'll sometimes see that for bigger apps, but having a ground-floor view would be something else.