Very neat video. I should try my mare out for this! In a few years time see if she would be forgiving enough to allow people to do that.
The barn I used to board at had a vaulting team. We actually used my big tb gelding for a few months.
Here are a few "Vaulting" videos I had bookmarked to my youtube account which I thought were neat as well: http://uk.youtube.com/watch?v=GE_TYSST0x8 http://uk.youtube.com/watch?v=km4fqXsAqmU