We've all been waiting to see how the fabled WoWee Roboquad crawls. Now we know. The four-legged bot moves in all directions, has 3 different speeds, and a deep IR scanner to spot movements up to 13 feet away. Its sound sensors are reactive, and it can tell the difference between dark and light. Kind of like the LEGO Mindstorms NXT, but a lot less work. $119.
I've got some details on it's infrared sensing technology on this page:
It looks very impressive. Apparently the Roboquad can move quickly in any ground based direction. That cool looking head it's got has very sensitive infrared beam technology that can not only detect motion, but can asses the size of objects as detailed as the edges of doorways.