Having reviewed Pad & Quill cases for the MacBook Air and iPad, we already know they're sturdy, attractive, and well-made. But having spent a few weeks walking around with the new-ish iPhone 4S version, we can say it's definitely the one that gets the most attention from passersby.
It's called the Little Black Book, and that's exactly what it looks like, and should really come with a tiny pen (or iPhone stylus) to complete the illusion. The only drawback is how much thicker and heavier it makes my phone, but it also feels a lot safer than the plastic Griffin case I had on there before (which broke almost immediately). $80