Well, all seems well post-SP3 installation. There were a couple of hiccups - Windows Live Messenger now complains (error 2771) when it is started up that there is a component missing, and installation fails. This has been observed by others who have installed Service Pack 3, but it looks as though a simple re-installation (assuming you already have the latest setup downloaded) should fix it.
Secondly, though not SP3 related, I noticed that Windows Update had a new audio driver for my motherboard. I installed it and rebooted, this has resulted in the Intel Audio Studio app from failing to load, complaining that “Sonic Focus drivers must be loaded for this application to work”. However, I still have sound coming out of my speakers, and the only use the Intel app was put to were graphic equalizer-related. Think I’ll just leave this be for now…

Anything nice and/or useful in SP3?
Not much that is obvious externally at least.
From the positioning of start menu shortcuts to their default position, I’m guessing Outlook Express and the ‘Set Program Access and Defaults’ app may have been updated.
Also, recurring calendar appointments in Outlook 2007, which were imported from a previous PST file (are they stored in there? it was from an old OS install at least) were finally editable - before I was given errors when I tried to amend them.
Whether the above are down to SP3, other updates, or completely unrelated, I can’t be sure.
The IE address box toolbar (no idea what it is really called) has been removed; don’t know if this was to prevent issues, or due to various legal rulings re. Microsoft’s integration of their browser into their OS etc.
Thank your for the review. No need to hurry with the SP3 installation for me, I guess.