More on Vista SP1 Prerequisites
I've found a little more info on the Vista SP1 prerequisites. First and foremost, it appears that the private-only release of SP1 has now been changed. Vista SP1 RC (remember that this is a test-build only) is available here.
Mary Jo Foley reports that the three prerequisites are:
KB935509 This updates is only required on Windows Vista Enterprise and Windows Vista Ultimate editions (which have Bitlocker capabilities).KB938371 This update consists of fixes for several components (including the TrustedInstaller), increases the success rate for installing the service pack and enables the service pack to be uninstalled successfully.
KB937287 This is an update to the “Servicing Stack” or the Windows Vista component installer technologies built into Windows Vista.

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