Arccos 360 Performance Tracking System, $250
This really is the age of knowing…everything. Distance to the pin, distance to clear the bunker, or how off line your driver has been all day. The screw-in caps measure all the numbers that an amateur really wants—distance, consistency, fairways hit (or missed), putts recorded, etc.—and tosses it into a slick smartphone interface. It's one of those things where you don't know what you're missing until you try it.