The Ushahidi Platform allows anyone to gather distributed data via SMS, email or web and visualize it on a map or timeline. Their goal is to create the simplest way of aggregating information from the public for use in crisis response.
What is Ushahidi? from Ushahidi on Vimeo.
Useful Links
Ushahidi website
Ushahidi forums
Ushahidi blog
Ushahidi wiki
Example deployments of Ushahidi
Ushahidi on Wikipedia
Ushahidi on Twitter