Very cool idea. I recently spent quite a while paging through HNSearch.com looking for book recommendations.

My recommendation would be to make sure the "Next" button never moves. Some really long titles cause it to get pushed down a bit and that gets annoying when you're clicking on "Next" at a fast rate.

I also agree there needs to be a little more information on the page because of the sometimes-indirect post titles. I find myself hovering the Amazon link to see the name of the book.