http://www.ourcourts.org/flashgames/dihar/index.html-interactive and fun, focus on rights that middle and high school students would be interested in, i.e. search/seizure, speech, etc.
http://www.inspiration.com/Inspiration-countless uses for social studies lessons, understanding in the visual world
http://www.armchair-travel.com/home/index.htm-virtual reality tours around the world at various historical sites