Texrat beat me to the pc "function keys" answer. But your response is a little fatuous - the single d-pad was obviously seen a s a good idea for the 770 and 800, and double ones are for gamer/multi-use devices of similar size. The regularity of iphone comparisons in some of the answers on this thread are a little worrying in some respects - the iphone in not a nit and the nit is not a phone.