http://splinter.com.au/hacker-news-reader
https://github.com/chrishulbert/HackerNewsReader
And its on the app store if you couldn't be bothered firing up xcode:
http://itunes.apple.com/us/app/hacker-news-reader/id457519010?ls=1&mt=8
Anyway, hopefully someone out there can learn something looking at the code. There seems to be a dearth of example code / foss code from actual proper apps out there. Have a nice weekend all!