Want to get more diagnostic info than your car's built-in computer provides? Check out the Car Chip Pro ($120). This deceivingly-simple gadget plugs directly into your auto's OBDII port, recording all sorts of data about your car's performance, your driving styles, and more. When you're ready to review, simply unplug the dongle and connect it to your PC via USB to extract the data. No greasy car repairman required.