Designed by Apple, the first case for the iPad is called simply the iPad Case ($39), and is a relatively bare-bones design: using a protective lid (which, note to case makers, we're not enthusiastic about) that folds around the back to become a prop-up video stand, the case is made from vinyl-like PVC plastic and has a microfiber interior. It's designed to provide access to the device's side buttons, headphone port, and so on, only exposing the screen…