Extra, extra, breaking news!
As I just mentioned a few days back, the Revit API developer guide is back on WikiHelp again.
Still, as we recently discussed here and in the Revit API discussion forum, a PDF version of the developer guide can also come in very handy now and then, e.g. for offline perusal.
Ian alias Keldar67 now repeated his heroic Revit 2013 feat and presents the Revit 2014 API developer guide in PDF format.
Please take a look at his magnificent 450-page achievement, adhere to his request to take the 'gift shop route' and give him kudos for his good work.
Thank you, Ian, and thank you, fellow Revit API developers.