App looks very nice. Just one issue: How can I see comments? This is a major point for me and a better interface would help, it's impossible to read comments on a small screen via the web interface.
For the moment, you can read posts using iHackerNews (that's the quick solution I came out with). I'm working on native comments but it will take some time (don't expect it this month, I'm too busy).
The scrollbar could also use more visibility.