Simon Parkin at Chewing Pixels comments on a visual study of videogame controllers, where he found a cool graphic comparing 25 years of controllers drawn to scale (excerpt pictured). He points out:

the stat rundown underneath each image revealing how the number of sticks and buttons gamers have had to contend with over the years has multiplied. From the stark simplicity of the Atari 2600's controller through to the WiiMote's thicket of plastic protrusions, lasers and motion sensing technology, our videogame interfaces have never been so complex.

Parkin's conclusion:

There seems to be a direct correlation between graphical capabilities and user interface complexity.

And he closes with a picture of the MOAGC (Mother of All Game Controllers). If you've got one, you'll probably know what I'm talking about before you even check out Parkin's blog entry.