I came across these manuals while searching for detailed info about new Nikons and added to my site. It is a good thing that Nikon USA made these available to everyone, these would give an idea to ones that are considering to buy d3 or d300.
Errr Canon do exactly the same... This is really nothing new. Just google search "Brand Model-number "manual" " and the first result is nearly always the manual for nearly every camera you can think of.