werd! thanks for the info, I hadn't heard of AUD recording in true 5.1 before, much less seen any recordings on the net.

For these to be circulated losslessly, and in a format that's currently available/affordable for everyone, uncompressed LPCM 5.1 DVD-A, or MLP lossless (big $$ for the encoder) 5.1 DVD-A would be the way to go. Lossless surround sound isn't part of the standard for DVD-V.