Geo this is an extension for Google Chrome. When you install it you get a little globe icon on your tool bar. If you hit this globe button the extension analyses the current document and shows you a map of the geographical data in the document shown as a map.
You can see Geo this in action in the following screencast:
Geo this is available on GitHub for downloading. Check out the source code at: http://github.com/codepo8/geothis