If you are looking for Apple drivers for a 32-bit Windows Vista guest operating system Apple has released v1.2 of Boot Camp which includes drivers for Vista.
If I have a Windows XP image on Fusion, do I need to get the new drivers in Boot Camp 1.2b? Any improvement?
I've applied them to my XP image. The installer does offer to upgrade them. As for improvements, the read me file is scant on details. The updated drivers appear to be working fine for me.