Ooh! I've seen the first and last (they appear to be the same :P), but where'd that middle one come from? It looks like it could really fly up, rather than just give panty glimpses.
EDIT: By the way, the dancing upskirts groups seem to have gone stagnant. They're not updated anymore, though there's still good stuff on them. I've made a new group dedicated to spinning skirts at
http://groups.yahoo.com/group/spinningskirts/ So check it out if you're really into this stuff. We could always use more contributiors.