ArtsAlive.ca is the performing arts educational website by the National Arts Centre in Ottawa, Ontario, Canada. It is an amazing site that, among other things, has performing arts related resources for teachers and students. ArtsAlive.ca has heaps of great tools for teachers of music, theatre, dance, and collections (costumes, etc.):

The virtual dance studio is amazing. Students can choreograph their own dance compositions by putting together beginning, middle, and end sequences of dance movement. They can choose from female ballet, male modern dance, or female modern dance.