Daniel_K has released an updated driver package for the Audigy and X-Fi Soundblasters. The one key fix I've come across is CMSS now works on the Audigy 2 ZS.
Update for RC: These are what I'm using at the moment with my Audigy 2 ZS with the 7100 release candidate build:
MD5 hash: 16BEC9D7C047EF46DDA4F40AF1D47B1C.
Audigy forum post.
If you're downloading from elsewhere here's the MD5 hash: 66DA82FC18E49F3B32172A61BEDD0164.
And here's the MD5 hash: 76CBA45C9DF761FFBC8BD61D17B3D127.
From my testing over the last few days the Auidgy works as well on Windows 7 as it does on Windows Vista.