I have some constructive criticism and possibly some extra info for you:

You should add a section about processor affinity. It needs to be dealt with, especially on quad-cores, as it greatly increases framerates. By default, only two cores will be used by the 5 WoWs.

My setup, btw, is this:
Q6660 Quad-Core CPU
4GB ram
8800GT

I am maxing out my framerate on 5 screens up at once (my setup is 4 quaded on left monitor, fullscreened main on right). My maxfps is set to 75, and I am 70+ fps on all screens almost all the time. Before I set the maxfps, I was getting 100+ fps almost everywhere.

The XP dual-view issue is really important and I missed it the first time reading your guide, just now. I tried using XP dual-view both with a single card w/ two monitors and two monitors on diff cards. Same terrible result both times.