I understand the USB / combo outlets serve a niche market where a person can't access the electrical panel to turn off power to the outlet to safely install a new outlet, but they exist already in dozens of forms for people who can.
http://www.homedepot.com/b/Electrica...vZc33aZ1z0r7vs
It reminds of the Kickstarter project for the butter knife with the little holes. Almost all butter knives with the slightly serrated edge do that already if you hold them at the slight angle to the butter.
