More commonly lately, Wikipedia is being used in many different applications, both online and in the real world.
PlaceOpedia is a project to link Wikipedia's geographical articles to Google Earth maps, allowing visitors to http://www.placeopedia.com/ to add their own connections. The ever-growing database of connections between latitude/longitude coordinates and Wikipedia URLs is available under a Creative Commons license. (A related project, currently in demonstration mode, is http://www.yourhistoryhere.com/, a collection of local information, history, and trivia attached to Google Earth locations.)
Sean Billig has written a free Wikipedia Dashboard Widget for Mac OS X v10.4 operating system. In his announcement of the release of Tiger , Apple CEO Steve Jobs used the Wikipedia widget to demonstrate the many uses of Dashboard.
Matt Biddulph of the BBC found a way to use Wikipedia and a Yahoo API to build a network of directed links, showing how British government figures are related to each other.