Enter Mapi Cases. Not only do their iPad cases rotate to support the iPad in portrait or landscape modes, but they do so with style! The quality of the leather used by Mapi is top notch.
They have a huge selection of cases, and colors, and they also support the iPhone. Right now, they have iPhone 4 cases, but I'm looking forward to cases for the iPhone 5 and the rumored iPad mini.
The cases aren't cheap, to be fair, but they are high quality and designed to protect even more expensive gadgets. To paraphrase that old L'Oreal commercial... "Because Your iPad is worth it!"