Though they're made from the same leathers and each sold in 13 different color and texture combinations, Sena Cases' WalletBook ($52) and WalletSkin ($52) are two different types of iPhone 3G case designs. WalletBook is a flip-style case that opens like a book to reveal the iPhone 3G's face, as well as pockets for cards and cash, while WalletSkin looks like the company's LeatherSkin cases from the front, but has a flip-open rear pocket with spots…
