Was just told about a website for Lego NXT Robots that I just had to share.
Damien Kee has a wonderful site and also sells books/Curriculum for using NXT in the classroom.
My favorite is a simple to build NXT base (much easier to build than the one in the instruction book that comes with the NXT Education Kit). These building instructions are at: http://www.damienkee.com/home/2011/8/20/domabot-classroom-robot-design.html