Yeah, the full install is kind of buried on the MS site,
but it's been there for about a week and now is at this
link -
http://www.microsoft.com/downloads/details.aspx?
FamilyId=049C9DBE-3B8E-4F30-8245-
9E368D3CDB5A&displaylang=en
They call it the Network Install, which makes sense when
you are planning to use AD to deploy it.
I've used AD to distribute past SPs in a fairly small
environment. I guess the best thing to do is to try to
schedule groups of machines at a time to reboot late at
night. If a user reboots, they won't be able to use their
machine for a while as it installs.
By the way, all of the MS SPs and other updates have
helpful switches. The problem is that sometimes you have
to go to thier support site to find out what they are.