Brett Clements just sent me this example of a video with a panorama aspect ratio that PlatinumHD.tv is currently working on.
"This has never been done before. We shot this using two Canon 5DMII's with two 17mm Tilt Shift lenses, using an Oracle controller on a Kessler slider. The images are WIDER, without distortion, than anything ever produced. We also re-designed our player to stream videos in this cinemascope aspect ratio. The layout is as rough as guts at the moment. Designers: Christian Fitzpatrick and Michael Suzor."
This is a aspect ratio well suited to view properties like this 19th floor condominium. The only problem I have is that it get's smushed down to 16:9 when I display it fullscreen on my 16:9 iMac screen. As Brett says, they are still working on ironing out some of the details.