OK, I don't really need this, but I need it, if you know what I mean (and I know you do). The Suunto G6 not only helps you keep score (most days I really need a computer to help me), but it measures your swing velocity, tempo, backswing length, and so on. After you train it at the range, it can tell you on the course if you're off your normal swing. After the round, you can download the data to your PC for more second-guessing and Monday morning quarterbacking.
Pretty slick, although probably not $550 slick.