Andy Sernowitz pointed out an example of a product feature few probably think about. A big frustration for any parent is changing batteries for kids' toys. Often the toys require a special size screwdriver, and the hunt around the house for the proper tool while the kids are begging to play with the toy can be overwhelming.
Leapfrog replaced that screw with one that could be opened with a penny. They did something great with such an insignificant product component. What can you do?