USB 3.0 is alive and well on the new MacBook Air. While I normally have issues with this usage model on most of the clickpads I use, Apple's implementation is both the exception and the benchmark. I typically keep my thumb on the clickpad, near where the right mouse button would traditionally be, and mouse around with my index finger. Finger rejection is handled extremely well under OS X, accidental clicks are very rare. The clickpad is glass covered which makes it very smooth and comfortable to use. Clicks are easier towards the bottom of the pad than at the top where the hinge is. Apple continues to use the top hinged design on its glass covered clickpad. We spend so much time pointing out poor clickpads in the latest Ultrabooks that it's important to mention just how good the clickpad is in the MacBook Air.
You can either choose to control it on your own or let the ambient light sensor control the intensity of the keyboard's backlight. Apple offers fine grained controls over the keyboard backlight (16 adjustable levels). The 2012 keyboard is nicely backlit, just like on every MacBook Air but the 2010. The power key is functionally no different than the old power button - tap to turn on, hold to power down in the event of a hard lock. The dedicated power button from the older Macs is gone and replaced with a power key that looks like another function key. Apple's keyboard remains one of the best on the market. As Apple has now fully transitioned to this style of keyboard across all of its Macs, I can't really say I have any complaints about it. Key travel and physical feedback are both as good as they can get on a chiclet-style keyboard. The function keys are half height on the 13 and even smaller on the 11, but there's no sacrifice in key size otherwise. You get a full sized keyboard on both the 11 and 13-inch models, with the alphanumeric keys measuring ~15 x 15mm. The keyboard on the 2012 MacBook Air is the same as the 2011 model.
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