Vista - Get SP1 the hack way.. :-)

http://www.neowin.net/news/main/08/0...-1-in-the-wild

its a small tweak and you get the SP1 in windows update

also read this blog

http://blogs.zdnet.com/microsoft/?p=1165

from first link>>>

By now many of you may have seen reports of Microsoft Windows Vista Service
Pack 1 in the wild. For a while, it was merely speculation (and several good
hints) towards Release Candidate Refresh 2 (RCR2) being the Release to
Manufacturer (RTM) build. There has been a 'registry hack' going around for
a few days now to enable the option to download SP1 via Windows Update. This
'hack' is actually straight from Microsoft, which was given to beta testers
on Connect January 23rd.

According to Geeks Anatomy, Jeff DaVos (a Windows Vista SP1 beta program
leader) has said on the Connect news group that this is indeed the same
release being used for RTM, and that "What you got is what we're all running
our Vista machines here internally - we definitely RTM'd".

Note: As I am sure Microsoft will say, using anything except for files
downloaded from Microsoft directly is a risk. If you plan to install SP1 via
the registry changes, you are accepting this risk.