I was probably one of the first ones in Europe with the RAZR, then you saw it in the movies. Great phone for calling, even though the buttons look great typing was a bit cumbersome when intensely used.
Besides the obvious graphic design lessons, I think there are some lessons that can be applied to any creative field, just in the way he's working. He's such an inspirational creative force. It's a healthy reminder not to take yourself too seriously and allow yourself to play as a means of exploring solutions.
You can also look up his talks which are also quite good.