Don't forget social networks like Facebook and Twitter, which are useful not only for planning before you go, but also for once you're on the road, since you can continue to access them through your mobile device. Ask in your status update: Does anyone know a good-value hotel in Rome? Coolest spots for dessert and coffee in New York? The best place to get cowboy boots in San Antonio? You'll be surprised at the number and variety of suggestions you'll get.