FastMac U-Socket: Simple Yet Brilliant
The above picture pretty much says it all, doesn't it? It's so simple, so obvious, yet so brilliant. $19.95 per plate is a bit expensive if you deploy them all over your house, but I bet the average home could make make great use of a handful of these placed in smart areas for charging smartphones, tablets, MP3 players, etc. Each USB port kicks out a potent 2100 mAH, which should be plenty to charge any device that can accept USB power. I think I might order a couple - I'm not much of an electrician, but I suspect they'd be pretty easy to install. Just make sure you turn off the breaker for that zone of your house first!