Made from Nappa leather, Marware's new C.E.O. Sleeve for iPhone ($25) is yet another simple wraparound fabric-lined case for the iPhone, interesting only because of its nicely stitched front and back leather, and detachable Multidapt belt clip, and detachable clip nub. Soft elastic sides cover portions of iPhone's body, the front, back, and bottom leather surfaces preclude use of iPhone for anything but music while it's inside. As with Marware's other…