Symantec Antivirus update
Symantec has updated their Corporate AntiVirus product to make it compatible with Windows XP SP2, so far, no problems for me on the 4 boxes I've installed Service Pack 2 on. If you're running version 9 of SAV, get the patch here.
You'll also probably want to patch your existing SAV 9 .msi file so that you don't need to patch new installations in the future, just use the msiexec command listed here