It's surprising how sensitive the capacitive sensor in Macbook trackpads can be. I found an app once that gave a visual indication of where touch events were oc

It's surprising how sensitive the capacitive sensor in Macbook trackpads can be. I found an app once that gave a visual indication of where touch events were occurring on the trackpad, and it can detect your finger before you're actually touching the pad. Of course, the software and hardware is calibrated to have a specific threshold, but the fact that technology is commonplace that can detect when something is near it is just amazing. A former roommate's Dell laptop did the same thing - the controls on the side lit up when your finger got near it, so you didn't have to fumble for the buttons OR deal with annoying LEDs all the time. This is part of the reason the iPhone always felt so fluid to me. I can flick a list, barely even grazing the screen, and the list will spin like a slot machine. It gives you such an immediate sense of powerful, accurate control that it's very gratifying to use.