Marware has announced that it is now shipping its Eco-Runner case for the fourth-generation iPod nano and its Sport Grip case for the second-generation iPod touch. The Eco-Runner for iPod nano 4G is a combination wrist/armband case made form eco-friendly materials. Designed to accommodate both the iPod nano and the Nike+iPod receiver, the case offers an integrated clear vinyl protector for the nano’s screen and Click Wheel, open access to the headphone jack, and comes with an attached wristband and armband extension. The Marware Eco-Runner for iPod nano 4G comes in grey with green contrast and sells for $35. Marware’s Sport Grip for iPod touch 2G is a form-fitting silicone case featuring a protective Dock Connector slot, open access to the touch’s screen, and including a clear film protector and cleaning cloth. Available in black, white, or frosted silicone, the Marware Sport Grip for iPod touch 2G sells for $20.