Now...I installed sp3 via Windows manual update 2 days ago smoothly with no hitches and have noticed the following:
I have an icon for an 'A' floppy drive now - didn't have one before
I don't get the date displayed now when I cover the time in the taskbar with the pointer 'arrow'
Some DVDs now stutter - may try an Nvidia driver reinstall
Using FRAPS, vsync off and the Black Death, sp2 was Min 21, Max 103, Avg 58. sp3 is Min 22, Max 171, Avg 69. I haven't altered anything else.
Mixed feelings with this, but generally fine.