Similar to the company's earlier Tradition leather cases for iPod nanos, Noreve's new Tradition for iPod nano 3G ($40) has a flip-open front lid that's magnetically attached to the nano's face, plus a detachable rear belt clip and nub. The premium leather options include 15 different color choices -- the sueded Passion Vintage is shown here -- as well as a wide variety of colored glossy leathers. Access to the nano's headphone port is provided on…