David Pogue is pretty worked up over AssistiveTouch and I can see why. After reading his piece I just played around with it and it’s quite fantastic. Settings/General/Accessibility/AssistiveTouch.
Try it (iOS 5), it’s quite interesting.
I’m most interested to see if it might make the iPad more accessible to my 96 year old mother. I don’t think so but it would be great if Apple worked on making iOS devices more accessible to the elderly.