Retailing for about $100, Microsoft Streets and Trips 2008 comes with its own compact SiRFStar III GPS receiver that plugs into your computer’s USB port. The provided software is preloaded with maps of the United States and Canada, including information about points of interest and the ability to give you turn-by-turn driving instructions. It’s arguably just as good, if not better than the standalone units. The biggest drawback, of course, is that you’re lugging a laptop around instead of a little handheld device.