The other 17% 'unknown'
A couple of people have mentioned Creative, and I have not seen a good driver escape their codemills for a good few years (Maybe Audigy was the last?). I hereby nominate them as a strong candidate for the title 'unknown', and am surprised at the Ars for not hinting at it themselves. 'heystoopid' said they should be 'top of the list' ... looks like they are a strong contender for sitting in fourth place :)
Can anyone remember the last *good* Creative product? I had an AWE64 Gold that was pretty damn good in its day. SoundBlaster Live! was pretty good, too.