Gizmodo.com is reporting that retailers will begin taking pre-orders for the forthcoming Lego Mindstorms NXT robot development kit starting April 1st. The system, priced at 
150. I’ve only found a few hours to work with it so far but am definitely impressed. My recommendation would be to swing by Radio Shack and go with Vex instead. You’ll be building robots tomorrow instead of 5 months from now, and with the money you save you can pick up extra components like the rechargeable battery pack, additional servos, sensors, etc.