We're not fond of iPod holsters -- all derivative of Apple's long-abandoned free iPod cases -- and though XtremeMac ups the ante with its Verona Holsters for iPod classic and iPod touch ($30 each), the differences are basically cosmetic, not functional. You still get a leather case with slightly expanding sides and a rear belt clip, but now the leather's hipper thanks to small aesthetic tweaks and stitching. XtremeMac makes different versions for…