Looks nice but I don't think I would ever use something like this. 70% of the time I'm on a browser so I prefer to just come to the website. A good app for iPad would be good since tapping the tiny HN links on there is terrible.
Not too pretty though :-).
I'm a bit tired of tapping between browser screens and always going into HN. I'm too much of an addict for those extra steps :-).