Belkin has introduced its new Micra and Fuse Cases for the fourth-generation iPod nano. The Micra Glam case offers a shiny, sparkling finish by embedding glass beads inside the clear case, while the Micra Dusk case offers a smoky charcoal tint, subtly changing the color of the nano inside, and the Micra Chex case adds a white checkerboard pattern to the device. Every Micra case is made from polycarbonate, includes a ClearScreen Overlay screen protector,…