What about the reversible cable connector? When was the last time you had a cable that didn't require looking at the cable before plugging it in? I know it's not really an innovation, but I don't understand why all cables can only have one way of going in -- when you plug in your usb cable, it's not obvious that it's upside down. Nobody looks at their audio cable when they plug in earphones; why can't normal computer cables be like this?

It does take a little more circuitry to detect orientation, but it seems like it would be worth it for a connector that gets used a lot.