As part of the discussion about server push for never-ending documents Félix Hauri published a nice example visualizing realtime data from a Photovoltaik system located in Bex, Valais, Switzerland. If you access the site from other parts of the world, bear in mind that the system is located in Switzerland, so, it could display 0 W when the sun is down in Switzerland.

Red Hat publishes a study on worldwide open source activity and growth. Parts of the study is an interactive map indicating the level of involvement of an individual country with the open source movement. The map is implemented with OpenLayers and SVG. You may click on a country to display ranking information, split up into government, industry and community involvement.