schacon/gitbook — pull request #30 by Nitrodist (2011-12-19 13:41:15+00:00)
Title: Added JS so that you can navigate using the left and right keyboard buttons

Click left, you go to the previous page... click right and you go to the next page.

Takes into account if you're at the beginning or end of the book as well (according to the text of the anchor links).