iSkin today began shipping its new Duo case for second-generation iPod nanos, which the company announced in early January at the Macworld Conference & Expo in San Francisco. The Duo case protects Apple's second-generation iPod nano with a dual-layer design that combines a colored anodized impact-resistant VISOR with a shock absorbing silicone layer alongside a clear screen protector. The VISOR is metallic coated to resemble Apple's second-generation Nano, adding only 1.65mm to the player's overall thickness. The case ships with a bottom silicone docking port cover, a removable belt clip, a Universal Dock adapter to expand dock compatibility, and an iSkin adjustable lanyard. The Duo is available for $30.