We can't upgrade to SP3 at work due to a few bugs that haven't yet been rectified.
The main one is that roaming profiles don't load if a user changes their password:
http://www.edugeek.net/forums/windows/2 ... p-sp3.html
http://forums.microsoft.com/TechNet/Sho ... &SiteID=17
It was fixed it Vista but not SP3 as yet.. (http://support.microsoft.com/kb/941797)
Cheers,
Andrew