If you really want to get your hands on SP1 for Windows Vista (and can’t wait for it to appear in Windows Update), the standalone installer is here for the 32-bit version of Vista. For those of you with the 64-bit version of Vista, get your installer here. Remember, you’re always taking a risk when installing a service pack so back up your stuff before you try this out. It weighs in at 434 MB for the 32-bit version and 726 MB for the 64-bit version, so it will take a while to download. I’ll be letting you know how it goes when I have played with it for a bit.
Update: According to this blog entry, it has been released to Windows Update. There’s more useful info there as well.