There have been some threads about authoring 24/196 and/or 5.1 audio on DVD-Audio discs. The solutions I\'ve seen have been in the hundreds of dollars.
I just read about some basic DVD-A authoring software for $99. The bad news is that it\'s not due until late June, and it\'s only for the Mac.
It\'s also limited to 48kHz for surround mixes and doesn\'t allow photo menus. But it will do 24/192 stereo audio, which is enough for many of us.
I\'m a PC guy, so this will do me no good, but it will be nice to see the price of DVD-A authoring come down to the hobbyist-level.