WikiFieldTrip is a Google Map mashup that displays Wikipedia articles based on the current map view. The relevant Wikipedia articles automatically load when you drag the map around or search for a new location.
When you click on a map marker an information window opens with the Wikipedia article. Each information window also includes a star. If you click on the star a link to the article appears in the map sidebar. In this way it is a possible to create a list of Wikipedia articles for later reading.
Other Wikipedia Mashups: