Got all the way through finding a book I was interested in (whoever said check the reviews, thank you, a couple I was interested in were slated), then clicking for the download link and then...502 Bad Gateway.

Possibly demand has exceeded expectation.

(As a footnote I picked the Node Cookbook, as I was interested in either an Obj-C, a Node or a RoR book but the RoR stuff was published 2008, so maybe outdate somewhat)