Have you ever wanted to swap a file between a couple of your own computers without setting up file sharing and mounting a volume? Or pass a file to a friend or colleague without joining a common Wi-Fi network, setting up ad-hoc networking, or emailing it?
AirDrop is a solution to that common problem. Added in 10.7 Lion, the feature lets you find and share files with other users near you. It has a pile of provisos that I discuss below, but it’s a remarkably nifty way—when the right hardware is available—to hand files back and forth.