9to5Mac: Apple has been the leader in miniaturization since the original iPod’s debut, which marked their entry into the ultra-portable gadget market. Fast forward ten years later and we have iPad 2 and iPhone 4 that are just 8.8 and 9.3 millimeter thick, respectively. Matter of fact, iPad 2 is actually thinner than your shiny iPhone 4. Even though Apple has come a long way in a short while with such ultra-portable devices, they might hit a roadblock soon, which is your regular 3.5 millimeter audio jack. Needles to say, there’s a patent for that.