I checked out what's the all the fuss, and it seems that Creative has actually done something quite goofy. Bear with me, the problem sounds quite unreal.
The whole problem seems to be that some part of the Audigy cards (EAX?) do not seem to work in Vista. But they do work in XP. Creative has stated that it will not work in Vista, but have sold them as Vista capable or what ever the hell it is called. Unfortunately, this one guy wrote a driver that actually enables the usage of the (EAX?) functionality in Vista, and now it seems that the reason Creative originally prevented is that they have licensed the technique separatively for each operating system, and in Audigy's case Vista was not included.
Now, most of the people shouting loud see that as a way to force people to upgrade an otherwise working sound card when (up/down)grading to Vista. And on top of that, people have started to think about further compatibity of newer Creative's cards and the support those cards will get. Since the company willingly castrates a sound card they have bought, what would stop them from doing it again? And, from people's point of view, Creative has willingly sold them a defective product that could be a reason for a class action suit. Add that on top of the vendors who have sold Creative's soundcards to customers that use Vista by using those very drivers since Creative's own do not work and you have a quite good problem at your hands.
To me this sounds like Creative has gone down since SB16 and AWE32 & AWE64 days. In the words of the guy who wrote the drivers, it is strange that Creative reacts much more faster to legal "infringements" rather than writes working drivers.
Mika