As Susan pointed out yesterday, Vista Service Pack 1 is available for TechNet Plus subscribers.
Since I can’t find my TechNet info, the good news is that Vista SP1 is also available for MSDN subscribers:
The EXE version weighs in at 434.5 MB:
The ISO DVD version is a stout 1.13 GB: 
Download speeds are pretty quick this morning.
1.13 GB in 18 minutes. I like that. 🙂
We’ll post the public URL when it hits general consumption status.