Power Support's Air Jacket nearly invented the category of imperceptibly-thin cases for the iPhone and iPod, so it's no surprise that the two newest versions -- for the iPhone 4 ($40) and iPod touch 4G ($35) -- feature a similarly svelte profile. Available in a transparent black or opaque clear color, the Air Jackets for iPhone 4 and iPod touch retain the originals' open access to all ports and controls, while adding a special "self-healing" attribute…
