Speck Products has introduced its new Fitted and ToughSkin cases for the fourth-generation iPod nano and second-generation iPod touch, as well as its CandyShell cases for the iPhone 3G. The Fitted cases are two-piece, snap-together hard shell cases featuring a fabric outer and cutouts for full access to all ports and controls. Initially available in black herringbone with pinstripes, the Fitted cases will sell for $30 each. The ToughSkin rubberized…