Nikon USA has posted a technical guide to the new D800/D800E SLR as a pdf download. The guide includes tips on high ISO shooting, using auto ISO and improving optical performance. It also has information on high resolution shooting and dealing with color artifacts and moiré.
The guide also suggests that the high megapixel count in the new SLR may cause problems for some users:
“While its high pixel count of 36 megapixels gives the D800/D800E resolution unrivalled by previous digital SLR cameras, a side effect is that bokeh and blur are made that much more obvious.”