Just so you know, I don't use Windows 99% of the time. I have it installed in VMWare for work because I need to use Outlook, PGP and Excel but that's it. And a lot of the time I can get by with GPG and Gnumeric.
But no I've never tried the BlackViper stuff although I've heard a lot of mixed reviews and his documents on Virtual Memory and pagefile tweaking make me think he really has no idea what he's talking about alteast with regards to that subject.
Basically shutting down some services will save a little memory, not very much because if the service sits idle long enough and doesn't do anything it'll be free'd from memory and only paged back in if it's needed. As I said, I havn't read the whole document but I can't imagine there are any registry tweaks that would do any real good. There some ways to help peformance like putting the pagefile on a seperate physical disk from the OS and your data, that'll help in the case that you actually do use the pagefile because it'll reduce the number of seeks on the OS and data drives. But if you leave the pagefile system managed it'll be fine for most cases because it'll be in the middle of the drive so any extra delays caused by seeking into the pagefile will be minimal.
The best things you can do for performance are get the fastest drives you can, my desktop at home has mostly 15K RPM drives and my notebook has a 7200 RPM drive. And get as much memory as you can, this will allow you to cache a lot of filesystem data into main memory and avoid disk access.