I have a couple usb ports on the back of my expo console.
They're just for charging usb stuff or powering usb gadgets.
I scavenged ports from a usb hub & attached them to the panel where my 12v outlets are.... have some pics in my photobucket somewhere... too lazy to dig around for them right now
They're powered by a disassembled cig outlet to usb port adapter I had around the garage. Extended the wiring from the old port to a couple new ports, just 4 wires for each port.
It only handles about 1a, but that's more than enough for charging a phone or running a flex led light or fan or small stuff.
The same could be done on one side of the radio bezel & if you have a usb port on the back of your head unit, you could re-wire a usb cable to tie into the ports on the bezel to connect a phone or mp3 player.