Impressively minimalist apart from its strong tendency to pop open on the fourth-generation iPod touch's front edges, United SGP's Ultra Silke ($20) is a matte-finished rubber case with top and side button protectors, headphone, speaker, camera, microphone and Dock Connector holes, and included screen film. Available in multiple colors -- including a very nice purple -- Ultra Silke thankfully dispenses with SGP's prior open rear Apple logo circles…
