I am a bit surprised at the decoupling mentioned and the 'pallet' mounts for the subwoofers. I was thinking they, those ultra-expensive cabinets that big-daddy linked to, were trying to use the floor coupling. When you say decoupling I would think it would be more effective to have the sub-woofer cones aimed horizontal rather than downward; the downward pointing design, wish I remember the thread, would seem to cause all the sound to be bounced off the floor which I can see aiding dispersion but increasing coupling.
So a good HT configuration would have all the surround speakers pulled away from the wall by at least 12" and best mounted on heavy stands. Maybe I will cheat and hang them from springs!

I am from the days when a woofer was a solenoid with a suction cup stuck to the wall. Hi-fi - one speaker does it all. Thanks again for the insights.