Whole Hog Room Treatment

I am wondering whether anyone has completely covered/replaced thier drywall or whatever with some other material for the sake of acoustics. The standard panels are good for most us who have limited resources, but are theoretically (my theory, at least) an incomplete solution. I would also appreciate any additives to this concept from people who know better.
ohlala: here's some info on a "whole hog" treatment soundroom in which ive listened. best acoustics for audio i've ever experienced (and you can have one done for YOU- if you have the $$$). -cfb


ps- i suspect albert porter's new room will also be world-class. perhaps he'll repost the decription of it or supply the URL.-cfb
Thank you