Game controllers or game pads, as some people call them, haven't really changed in 25 years. As you can see from the controller family tree (via www.axess.com/twilight/), controller designs have not exactly differed from generation to generation. Basically, every iteration has only added more buttons and a different design. Recently, Nintendo stirred things up a bit with the Wiimote, and now both Sony and Microsoft are jumping on to the motion controller bandwagon with their own designs, e.g. Arc and Natal. Read more for the full article.