Similar to the iSee for iPhone 3G, Contour Design's new Hardskin for iPhone 3G ($30) is a hard shell with rubber covers for the device's Sleep/Wake button and volume controls. The difference here is in coloration; Hardskin is completely black and opaque rather than see-through, and uses soft touch rubber as an outer texture. Like iSee, it doesn't come with a belt clip or a screen protector, but does nicely match the curves of the new iPhone model.…