By comparison with the company's Street Skin, Hard Candy Cases' Sleek Skin ($40, aka Smooth Skin) is different from virtually every iPod and iPhone case design we've seen before: it's a semi-hardened TPU rubber in one of five translucent colors, just thick enough on each side to retain its shape, somewhat like the clear plastic folders that become popular for presentations some time ago. Like Street Skin, it features a snap-on integrated screen protector…
