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The National Geographic maps can be found in their own section of Google Maps Gallery, which launched officially on February 27. This includes reference maps, wall maps, National Geographic magazine supplement maps, and other creations from over the years, all laid on top of the relevant Google basemaps.

Google's Ngram Viewer lets you search keywords in millions of books over the span of half a millennium, a useful tool for finding trends over time. For power users, the Ngram Viewer also has advanced options, such as searching for particular keywords as specific parts of speech or combining keywords.

You can select data sets and this program creates a map on google earth. Could be used for economics, social studies, etc.