Keith Combs is reporting that images of Windows Vista with SP1 already baked in are appearing on MSDN TechNet subscriber downloads. After checking myself, I find that only the English, French, German, Japanese & Spanish x86 versions are available thus far. Maybe they are still updating and the x64 versions will start appearing in a few, more on that later folks.
Keith is clearly ecstatic: "My download took minutes. Being first helps. It flew down the fiber pipe to my house at 1.8meg per second. I wish all my downloads were that fast. Your mileage will vary. I'm planning on "enhancing" my VM first thing. I'm going to enable IIS7, then drop PHP, MySQL and Wordpress on it. When I get it working, I am going to do a screencast on the process. Getting ready to record how to do that with Windows Server 2008 in a few minutes. Enjoy!"
He also mentions that the blog post is a rolling update, later he will post some more screencasts of the resulting installation. Thanks Keith!
Update: Microsoft have posted an announcement regarding the SP1 images availability on it's MSDN subscriber download sites: "The first wave includes English, French, German, Japanese and Spanish versions of Windows Vista with Service Pack 1. New files will be added every couple days, depending on server bandwidth, until all downloads are published."
(note the date, this is the slipstreamed version -not the standalone SP1 released earlier this month).