Google Maps and the Earth Day Network have teamed up to offer interactive Summer of Green maps of Las Vegas, Los Angeles, New York, Orlando, and San Francisco. These maps show the locations of and short videos about eco-conscious destinations such as organic spas, green hotels, eco-car rentals, and nature museums. This is a small-scale but good example of how maps, recommendations, and video together can be a useful planning tool.
I like this idea, and the short videos (find them by clicking on a map point or on a listing) bring these places to life. It would be even better if there were more listings and cities, but this is a good start, and certainly worth checking out.