I went to the Bang & Olufsen store today and got a demo of their new home theatre setup. Along with their television and sound system, they had a D-Box installation where they previewed Star Wars in Bluray with the D-Box chairs. It was an absolutely breathtaking experience. The chair literally moved with the film so that it felt like you were in a spaceship with Luke Skywalker. Combine that with the superior audio of the B&O sound system (Read: The downward facing subwoofer of the Beolab 5) and I might have just found my dream movie theatre.
They also have the D-Box chairs installed at the Mann 6 in LA, so I might have to check it out.
The video above describes the movie theatre version of the chair. The B&O home theatre version is SO much more comfortable.