Wii
I bought a Nintendo Wii the day it came out. Drove around Spring, Texas, where we were visiting some of Bridget's family, and found a Target that didn't have much of a line out front, near a Toys R Us that had NO line out front. Came back the next morning, an hour before opening, and got unit number 53 of 60. Yay!
It comes with a great game called Wii Sports, that's basically a series of mini-games, a demo for the motion-sensitive controller. Included are Tennis (HIGHLY addictive), Bowling (lots of fun, especially one of the training modes), Baseball, Golf, and Boxing.
Watch this guy get a great score in Bowling.
And this is unreal - the aforementioned training mode.