One of Sunlight's resident creative geniuses (yes, there are many of them) have taken all the Defense Appropriations Earmarks and made them available for viewing within Google Earth. (You can only view this using Google Earth which you can download from this page.)
And as they say: a picture really is worth a 1,000 words. One of our policy wonks loved the flight simulator that allows you to fly over earmark locations. It allows you to fly your choice of two aircraft anywhere around the globe, with custom layers visible from the aircraft.