I saw this article on LifeHacker today:http://lifehacker.com/5883723/upgrade-a-wall-outlet-to-charge-usb-devices?tag=diy
I will be buying a few of these for the house when i move to Texas!
For more information on a simple product you can install without any electrical know how, visit the product page below:
http://rcaaudiovideo.com/power/chargingstations/?sku=WP2UWR
here is another option:
http://fastmac.com/usocket.php