I am constantly reminded of this blog piece featuring Jonathan Ive, the product designer behind the iPhone, among many.

"Christopher Frayling reminded us at that point of Henry Ford's line about what his customers would have demanded if asked - "a faster horse" - and it's surely true that the point of innovative companies is to come up with products that customers don't yet know they need."

http://www.bbc.co.uk/blogs/technology/2009/07/listening_to_mr_iphone.html