Microsoft has made the current release of Vista RC1 available to early adoptors via Windows Update or as a stand alone download (~850mb).

http://www.microsoft.com/downloads/details.aspx?FamilyID=9de6260e-4275-482d-9524-de850c4dd91c&DisplayLang=en

Dan

You may also note a Office 2007 Sp1 was released today

http://office.microsoft.com/en-us/downloads/default.aspx?ofcresset=1

The Vista SP1 Download is a small Zip file with some documentation and a registry script to make it so you can see the SP in Windows Update

reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\VistaSp1 /f > NUL 2>&1
reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\WindowsUpdate\VistaSP1 /f > NUL 2>&1

reg add HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\VistaSp1 /v Beta1 /t REG_SZ /d c92ef077-adc4-46ef-b96b-02a42d60ede5 /f

Further, you can get the stand-alone installers at

32 bit - http://www.microsoft.com/downloads/details.aspx?FamilyID=be34577a-e925-48fb-9d6d-50fe9461f808&DisplayLang=en

64 bit - http://www.microsoft.com/downloads/details.aspx?FamilyID=c21c3978-3b7d-4d64-873b-3c9d26982d7a&DisplayLang=en