Over the years, Declan Butler has built some pretty good tools for Google Earth, including things such as the Avian Flu Outbreak Map and the Global Hunger Map.
Now he's created a map that shows all of the nuclear reactors on earth, color-coded by size and type.
The map has a ton of information, but some of the images don't load correct in the plug-in version linked above. To best use the map, download this KMZ file and load it up in Google Earth.
For more, check out his full post with more info about the map and data, or check out our post from yesterday that shows you how to see day-by-day imagery of the Fukushima plant after the earthquake struck