Trichoglottis brachiata, Cymbidium canaliculatun var Sparkesii, Grammangis stapelliflora ( or Grammatophyllum stapelliflorum, there is a "Black" Lady Slipper, I think it's called Cherry Black Lady Slipper.
If you go to Camp Lot A Noise Tropicals you can find Trichoglottis brachiata ...
http://www.clanorchids.com/store/tr.html ... As for the others I merely googled and found the names. Hopefully paphgirl will see this thread and should be able to shed some light on the lady slipper...