The following
CNNMoney.com piece, posted on Yahoo! Finance examines the success of the Wii and the DS, specifically the way Nintendo executives have shaped these consoles.
To sum it up, Nintendo has caught lightning in a bottle and hopes both the Wii and the DS will have great staying power. As you would expect, Nintendo is making incredible profits from these systems and hopes the good times will roll.
The piece also features some insight on the design of the Wiimote and the additional profits available from licensing from 3rd party game developers.
It is an excellent read and worth your time.