Another obstacle to upgrading to Vista is removed, some final drivers for X-fi sound cards have been released.

http://us.creative.com/support/downloads/download.asp?MainCategory=1&nRegionFK=&nCountryFK=&nLanguageFK=&sOSName=Windows+Vista+32-bit®ion=1&Product_Name=Sound+Blaster+X-Fi+XtremeMusic&Product_ID=14066&modelnumber=&driverlang=1033&OS=26&drivertype=0&x=34&y=11

But is the obstacle really removed?

REALLY?

if the drivers work properly, that's one of them gone yes (for me at least being an x-fi owner)