Would be good to allow you to order by position on the front page as well as total number of votes on the stories. It will allow you to see that even though github is sitting at number one as the most on the front page, they might only be averaging 4th or 5th place whereas something like BBC averages top 2 on every one of their articles.
Nice work.
You may want to mention HackerNews in the site title so that non-HN visitors will know what it is about - unless the omission was intentional.