Nice idea. Two things:

1) How are points assigned? I don't see any place to upvote/downvote, but I see that certain books have points while others do not.

2) There should be a way to sort by points.

Edit: Also, maybe a tagline at the top? (e.g. "Community curated collection of legally free books.") The 'about' page discusses the purpose of the site, but if I happened to just stumble upon the site, it wouldn't be clear how this is different from other sites that do not concern themselves with legality... especially since you have 'hacker' in the title ;)