iPod + iTunes

This entry is often cited for simplicity and for getting the balance right regarding device vs. service interaction through the use of iTunes. This is a combined entry including iPod and iTunes due to the power of their working in combination to keep device use simple and service encounters through iTunes rich and powerful. The version of the iPod's physical interface shown here is a particularly well-executed controller, keeping all key points of contact within the arch of a user's thumb and allowing for ease of use even while the interface is not being viewed.