I stumbled upon this very well done glider video of a long cross
country glider flight in Wangaratta, Austrailia. It uses a well done
voice over to explain all that is happening during the flight. This
would be a good introductory XC video.

Notice that they mention the "Diamond C" badge which, in another RAS
thread, was said to not be a proper term (the "C" part that is).

http://www.youtube.com/watch?v=xsZYFDbsxl4

Enjoy, John DeRosa