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Google Map of Cyclone Nargis
Here's a google map of Cyclone Nargis, which recently devastated Burma. It shows the path of the cyclone as it came off the Bay of Bengal, and marks the diminishing windspeed of the cyclone as it traveled over the landmass. It's got close to a million page views after only being online for 4 days, it's a beautiful example of people using the power of easy online mapping tools to communicate about their environment, it's just awesome.
The trouble is that Burma doesn't look like this anymore.