Ah nice, another one :-)
See also http://ihackernews.com/ or http://cheeaun.github.io/hackerweb/ or (broken ssl cert) https://msean5423.news.ycombinator.com.moovapp.com/, and now http://hn.premii.com/. I was looking into writing one myself.
Personally I won't be very excited before I see an app that's open source. I don't understand why somebody wouldn't share the code for such a simple thing.