Show HN: Experimental Mac app for reading HN

Yesterday I decided I wanted to experiment with different ways of reading HN. After considering a few options, I settled on a Mac app and spent a couple of hours planning/sketching on paper.

This morning I fired up Xcode and spent 4 hours hacking away and I must say I'm liking how it's looking. Since the project is in its very early stages, I though that it could be a very good time to get some feedback.

I've posted a few screenshots at http://imgur.com/a/rCbVN and uploaded a binary at http://abra.rm-fr.net/~fiam/HackerNews.zip

If you have some free time, give a try and let me know what you think about. I'll really appreciate that.