Picked up the new
CPU magazine the other day, good article in it on Vistas SP 1.
Speed up of bootup/shutdown, and other enhancements.
No extra apps are installed, so no dramatical interface changes, but it does improve it.
I am installing it now on my Dell laptop.
I put XPs Service Pack 3 on a short time back after seeing Bob's thread in this section.
The SP1 for Vista can take a long time to install, and it does about three reboots my screen is telling me.
Looks like Firefox 3 is coming out soon too from the link above.