Boomwave has introduced its new Raygun line of cases for the fourth-generation iPod nano and second-generation iPod touch. Made from high grade silicone, each Raygun case features a highly-detailed laser-engraved design on the back, and offers open access to all ports and controls, save for the iPod touch’s sleep/wake and volume buttons, which are useable but protected. In addition, each Raygun case includes a screen protector; the iPod…