Garmin’s gettin’ all 21st century on us here with HUD ($130), a portable heads-up display unit that takes your smartphone’s navigation instructions and splashes them on your vehicle’s windshield. Just stick the transparent film on the window, pair it via Bluetooth with Garmin’s StreetPilot or Navigon apps, and then keep your head up, son. You’ll see the distance to the next turn, current speed and even other info goodies like traffic delays and where the red light cameras are. As far as things on windshields, we’ve certainly come a long way from those Baby on Board signs.