Belkin's latest collection of iPhone 4 cases has a hint of that old wedding rhyme going for it: something old, something new, something borrowed, something blue. The simplest of the cases is Shield Micra ($25), a clear hard plastic shell that covers iPhone 4's back and most of its sides while leaving its face, top, and bottom exposed -- it's one of Apple's free iPhone 4 Case Program giveaway options. Next up is the more advanced and interesting Shield…
