Those of you who are previewing Windows Vista SP1 by going through the recent RC release, may find this FAQ of interest. The actual SP1 is scheduled for release in Q1 of calendar 2008.
Here's a link to the FAQ http://www.marclironblog.com/windows-vista/windows-vista-service-pack-1-faq/
Here's a link to the public Vista SP1 RC http://tips.instantvista.com/windows-vista-sp1-rc.htm