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Update done - now running Vista Home Premium 32-bit, Service Pack 1. Looks the same, and everything thus far seems to run just fine as before. I won't really be able to determine if it improved performance for awhile yet - no time really to do much tonight. SH4 and SH3 both fire up fine, but they were working great before too, so at least nothing seems broken by SP1.

P.S. a little under 35 minutes from download (5Mb DSL line, over a 802.11G connection) to final reboot back to my login screen. The reboots during stages 1,2, and 3 of the update are all automatic, so you can walk away and just let it churn.

P.P.S. okay, one thing that is definitely snappier is print spooling. I have a wireless inkjet (HP 6988dt), and there was always quite a lag in Vista between clicking print, and anything actually happening at the printer. Now, almost as soon as the progress bar starts to fill after clicking print, the printer kicks into life and starts on the first page.