There are lots of APIs and developer tools from Google so it could be a little overwhelming if you don’t know where to begin. In order to bring some order to the long list of tools available for Google enthusiasts, Google put up a table resembling a periodic table. The tools are grouped in categories and if you hover the categories, the respective APIs and tools will be highlighted and you can click on them to go to their respective websites. It’s entertaining if you like Chemistry or if you just like to see a cool visualization of Google APIs and developer products.
See the full interactive table here: http://code.google.com/more/table/