A number of sites that have recently popped up using Google maps to plot specific points of interest. HousingMaps.com caught my eyes since it takes the real estate classified ads from Craigslist and plots them using Google maps. So you can click on a city and search for real estate (for sale, for rent, etc.). You are then returned results as well as a Google map that displays each results location. While this site is not affiliated with Craigslist or Google it is innovative and worth a look.