I love PBS. This is a great resource that provides a dance timeline that dates all the way from 1619 to 2001. Although it isn’t all-inclusive, it does a good job of hitting many of the highlights along the way.
This is perfect for teachers or for those who simply want a deeper understanding of what the historical development of dance has been through time. It is interesting to see it in this format–much different than when you learn about it one piece at a time.
Oh, and they offer a free screensaver too.