Based upon the company's earlier Aluminum Sliders for iPods and iPhones, Core Cases' new Aluminum Slider Case for iPod nano 4G ($20) and iPod touch 2G ($25) update the previous foam-padded aluminum shells for the latest models. Finally, the iPod touch version of Aluminum Slider includes a clear film screen protector -- previously absent from the company's touchscreen cases -- plus dotted side grips, while the iPod nano version has an integrated hard…
