If you have a moment, can you take a look at the included vbulletin light style that also auto-detects mobile devices. It looks like it could be a replacement to the Mobi-style that we currently have. Unfortunately that style is only for vbulletin 4.1.x, so an upgrade to the forum software would be required.
The video wasn't that informative so I went ahead and registered. They are using 4.1.7.
Clean, large, easy to click interface
The message window grows vertically so it is easier to proofread.
Reply and quote buttons are available
No "show new posts" button
No "mark all posts read" button
The arrow on the right takes you to the "new posts" does not work on a per page basis.
The message entry window is too small, maybe half the width of my screen. It appears to have a hard coded size to fit properly on the screen held in portrait mode.