Google Maps has been asked or told to offer opt out options for removing places of residence from their maps around the globe. As that happens, a new service pops up, MapQuest by the people.
MapQuest has ventured into crowdsourcing. They are allowing the "crowds", people online, to edit maps online.
Anyone can register to be map contributors. Any rogue editors will be monitored by the community itself.
One can think of some amazing uses, especially in emergency situations. After a natural or man made disaster, being able to notate maps with damaged roads and bridges, or to add details that would be important to loved ones and rescue teams.
Google Map has something like this in other countries but not in the U.S.
If you want to take advantage of mapping by the masses, use http://open.mapquest.com
"New MapQuest site shows U.S. maps for, by the people", USA Today, December 16, 2010.