As some people on this list do things with computer vision, I thought
this might be interesting to people. There is an online database with
many different scenarios available for download at
http://groups.inf.ed.ac.uk/vision/CAVIAR/CAVIARDATA1/ . This database
is intended for testing computer vision algorithms under a variety of
circumstances. What's nice is that there is also an XML based ground
thruth data set for each video to compare your algorithms against.