Google Maps shows a list of the people that contributed with the most customized maps, reviews and edits related to a location. In some cases, you'll find helpful maps that show hidden parks, interesting museums or landmarks.
Google has also released a customized maps editor for Android. "With this application you can create, edit, share, and view personalized maps on your Android powered phone synchronized with the My Maps tab on Google Maps. Create a map on your desktop computer using Google Maps and then take it with you on the go and update it on location."