Crowdmap is the hosted version of the Ushahidi platform, which allows you to quickly crowdsource information to a map in real time. Crowdmap has typically been used to monitor elections in developing countries, map crisis information as an event unfolds or to curate local resources. Two examples include Syria Tracker which tracks the missing, arrested or killed in Syria while Vacant NYC keeps tabs on vacant properties in and around New York City. We've been using the service for the past few months to curate Sunlight Meetups and open government events taking place around the United States. You can see the latest events on our Participate page.