* A range of Lego compatible sensors and actuators Some that are blessed by Lego: http://www.hitechnic.com/products http://www.hitechnic.com/products ... and

* A range of Lego compatible sensors and actuators Some that are blessed by Lego: http://www.hitechnic.com/products http://www.hitechnic.com/products ... and some that are not: http://www.mindsensors.com/ http://www.mindsensors.com/ http://www.techno-stuff.com/ http://www.techno-stuff.com/ Also, this exists, targeted at the education market: http://www.vernier.com/products/interfaces/bta-nxt/ http://www.vernier.com/products/interfaces/bta-nxt/