Ushahidi, which means "testimony" in Swahili, is a website that was initially developed to map reports of violence in Kenya after the post-election fallout at the beginning of 2008. Ushahidi's roots are in the collaboration of Kenyan citizen journalists during a time of crisis. The website was used to map incidents of violence & peace efforts throughout the country based on reports submitted via the web & mobile phone. This initial deployment of Ushahidi had 45,000 users in Kenya, & was the catalyst for us realizing there was a need for a platform based on it, which could be use by others around the world. Since then we have grown from an ad hoc group of volunteers to a focused organization. The team is comprised of individuals with a wide span of experience ranging from human rights work to software development. We have also built a strong team of volunteer developers in primarily in Africa, but also Europe & the U.S.http://haiti.ushahidi.com ... their use of GoogleMaps ++
Also of interest: PearlTrees, a Flash concept mapping thingamabobble.