A new book has shown up on Amazon.com for the NXT, written by Michael Gasperi, Philippe E. Hurbain (our friend, Philo), and Isabelle L. Hurbain. Check it out here. There's not much detail given, but I'll check with Philo and see what I can find out...
Extreme NXT: Extending the LEGO Mindstorms NXT to the Next Level
April 2007 release date