The Nikon D4's manual was recently made available online, but if you're of a different persuasion you may be interested to know that the same has happened for the Canon EOS 5D Mark III. It's a slightly easier read than the D4's, at almost a hundred pages less and with more lavishly illustrated instructions, but it's still the sort of thing you're going to want to dedicate a rainy day to (unless you want to test the Mark III's weatherproofing, of course). Also available is the camera's Pocket Guide, which walks you through the basic steps of how to handle a $3,499 camera — we're not sure too many people buying Mark IIIs will be needing to carry a guide to the mode dial around with them at all times, but it's nice to have the option.
Canon EOS 5D Mark III manual is online for your perusal
The Canon EOS 5D Mark III's manual and pocket guide have been made available to read online.