Based on a similar earlier Griffin design, FlexScreen for iPod nano 4G ($25) still combines a hard plastic front shell with a silicone rubber case, but improves upon the prior version by including two rubber cases in the package -- one frosted white, and one semi-transparent black. The white case still lets the color of your nano shine through a bit, and both cases feature opaque ribbon-like designs on their backs. A cleaning cloth is included in…
