Touted as being "as thin as a name card," the Pinlo Slice 3 for iPhone 4 ($26) offers matte-finished plastic coverage for the sides and rear of the iPhone, and includes a screen protector. While the concept is interesting, there's so little material here that little should be expected in terms of shock-absorbing, crack-preventing utility; the box it ships in is more protective than the case inside. Openings are provided for the ports and cameras,…