"I want my site/store/software to be easy to use" is a requirement we hear all of the time. The original iPod crushed all of the other MP3 players on the market because it was so easy to use. History is full of examples of leaps of innovation making things so easy we can't imagine doing it any other way. Early cars were steered with a tiller like you would a small boat for over a decade. Doesn't that sound fun? Hard to imagine though because the steering wheel makes so much sense. The...