Mindsensors.com have done it again, released a product that really helps out people who build bigger than normal Lego models. I have had 1 major issue with the Lego Mindstorms kit and that is because there is no way to extend the cables unless you make your own or buy custom lengths. Both not a a easy thing to do. The original RCX Brick used standard 9v cables which were easy to extend, however with the advancements of the NXT saw it require a lot more wires (6 in fact) between the motors/sensors and the NXT brick.
For more information please visit Mindsensors.com Extender for NXT Cables