http://hnkindle.blogspot.com/
The application uses a specialized library (boilerpipe - http://code.google.com/p/boilerpipe/) for extracting just article contents from links. Also, HN has a lot of links showing up in the Top 30 moving up and down every single day. I have put in place a simple heuristic (which is explained in the app) to chose only the prominent. At the moment, the heuristic is quite arbitrary.
Your feedback is most welcome!