Straight from the Department of Why Didn’t Anyone Think of this Sooner comes the JuiceTank, an iPhone 4/4S case with an integrated wall charging plug- no cords needed! The plug folds flat into the back of the case when not in use and springs out with the press of a button when you need to charge up your phone. Lloyd Gladstone and Jesse Pliner are the product designers and have spent 9 months working on the JuiceTank so far. The plug design is even patent pending.
The case is made of durable textured polycarbonate for lightweight strength. The whole point of this is that you can charge your phone without cords anywhere you can find an outlet but there is a micro-USB plug in the back if you want to use a cord. This is yet another Kickstarter project that will be produced if enough funding is pledged. Expected retail price will be $70, however early Kickstarter pledgers can get it for less.
UPDATE!!! This product made it to production and is now called the PocketPlug and you can buy it!