Just a quick note for those blasting Windows 7 onto their machines this week. You may notice lower than usual volume with your SoundBlaster Audigy 2 ZS. I've had a few e-mails along these lines and it seems to be due to the drivers currently on Windows Update.
I'd recommend trying the latest Daniel K drivers, in the past these have resolved problems I've had with lower than normal volume compared to Windows XP/Vista. At the moment the latest ones are here, however there will be a new release soon to correct a few bugs in these. The latest official drivers are dated from July but I suspect also resolve this issue, although I haven't tested these since the release candidate days.