NXT 2.0 Inventor's Guide
David Perdue and Laurens Valk have done a remarkable job of creating what amounts to a comprehensive NXT 2.0 "missing manual."
In dedicated chapters the book offers some coaching in building basics (how to use gears, for instance) and NXT-G programming. Also, the building and programming instructions for the diverse (and very cool) models included are loaded with helpful information. The authors have clearly worked hard to anticipate what an NXT user wants (and needs) to know, even going so far as to explain the names of the parts—which is very helpful when looking for parts on Bricklink.com. ("L-shaped thingy" doesn't work).
The only thing that could make this book better is printing it in color; but that would have increased the cost significantly, so they've settled for making the best grayscale instructions possible.
It's definitely a "best buy" for the new NXT user.