A Great example of community mapping and the immediacy of tools like the My Maps feature of Google Maps is this map by Oliver Williams who is collating images, videos and reports relating to the current river floods in England.
When I looked this maps was less than a hour old !!
Not only is this a potentially powerful way of communicating up-to-date information quickly, it is also great at telling the human story of such events.
Written and Submitted from the Google Office, London.