Much like the same-named products for iPod classic and iPod touch, Incase's Leather Sleeve ($30) and Neoprene Sleeve ($25) for iPod nano are leather and plastic and neoprene cases for the third-generation, video-ready iPod nano. Just like the iPod classic versions, both cases cover most of the nano's body with either leather or a combination of face and back plastic and side and top neoprene, and each has an integrated clear plastic screen protector.…