Like the first versions of the Jam Jacket for the iPhone and iPod touch, DLO's Jam Jacket for iPod classic ($TBD) and third-generation iPod nano ($TBD) are silicone rubber cases that feature rear molded earbud and cord managers. They cover the iPod classic and nano Click Wheels, while exposing their screens and bottoms; a hole for the classic's headphone port is also found on that version's top. Sculpted side grips and other small design touches set…