Classroom Robotics: Claws lego NXT - Lego Arm
LEGO Mindstorms NXT Spider
Damien Kee - LEGO NXT Resources - a huge range of links and resources for integrating Lego robotics into the classroom. A Robotics in Education mailing list is also on this site.
HG Education Things
Fabulous tutorial about how gears work using lego!
Education & Technology
NXT Puppy - Ultrasonic and Sound Sensor Program
Aula Robótica: Lego NXT robot holds and lifts.
Street Sweeper Lego NXT
Building a Drawbot with LEGO (Scheduled via TrafficWonker.com)
This is a great Robot version of a Segway with instructions and a user video!
Free Lego NXT Mindstorms Robotics tutorial Climb A Mountain Use of gears Challenge 30