Saw these awesome limited-edition Incase iPad/Macbook/iPhone sleeves via Turntable Lab.  They were designed for Incase by the design firm Eley Kishimoto.  The sleeves come in black and magenta.  Eley Kishimoto has some other products using the same designs.  I don't have an iPad (or a Macbook or iPhone for that matter), but I would consider picking one of these up just in case I ever get one.