Arstechnica has a good review of the LEGO Mindstorm NXT. Seems like a great product, the biggest thing that this system has against it seems to be the price though. At $250.00 you will need a big paper-route to pay for it.

“Opening the new Mindstorms box set off the same spasm of joy, a sense of wide-open possibility that reminded me of those childhood toys. It was clear, just by looking at the 577 pieces, the four sensors, the three motors, the cables, wheels, and CD, and the NXT brick itself, that the dream thwarted in the early 80s could now be fulfilled: I would build a robot that could take over the world.”