The next big evolution in exercise equipment has arrived. Only you may have to fight your kids for a chance to use it. The Nintendo Wii is suddenly the newest must-have accessory for your morning workout.

Better cross Wii off your Christmas list. Move over Furby and Tickle Me Elmo. The Nintendo Wii has not only become this season's must have gift -- it may be the hardest to get holiday gift of all time and is causing near mass hysteria.