Currently I have a Sena Ultraslim sleeve for my 3GS and I'm looking to find something similar for my iPhone 4. I know that Sena and Vaja have pretty good leather cases, but neither will have cases out for another few weeks. Does anyone know of another brand with genuine leather? I came across Saddleback Leather Co., but their case for phones seems a little bulky and not very specific to the iPhone.