XtremeMac has announced its new line of cases for the fourth-generation iPod touch and sixth-generation iPod nano. The new offerings include the company’s signature form-fitting silicon Tuffwrap series of cases which will be available in four colors and sold in packs of two, the Tuffwrap Tatu with unique laser-engraved design patterns on the back and the Tuffwrap Play, a soft and flexible plastic case with ergonomic grips designed for gaming.…