I have a lot of things that need to be charged, and I found this handy device (I think at "Smarthome").
I installed it at desktop level and wired it from an outlet just below it, at floor level. It has 2 USB ports, and senses the power needs of any attached device, and shuts off the charging when the device is fully charged, although most devices today do that internally.
I find that it works great for iPhones, iPods and surely all things Apple, as well as Kindles. One big advantage is that I do not need to keep the transformers here for any devices that charge via USB cables, just the cords.
It's a little pricy, but very convenient and highly recommended.