This is the SmartCase Quattro4 Wrangler, a rugged case that fully encloses your iPhone, even covering the screen with a transparent glass. It's a two piece solid design. The best part, however, is the 2000 mAh battery pack.
What I like about it is that you can replace the bottom part of the regular case with a part that has a 2000 mAh battery. The manufacturer says that it will more than double your iPhone's battery life. If it gets enough funding on Kickstarter, it gets turned into a real product. Please let it become a real product. [Kickstarter]