For those of you who are looking to do this, I've done it and the results we're F***ING awesome.
nLite'd XP pro (down to 700mb) (w/Sp2)
Installed the on my laptop (newly formatted)
Installed bootvis, ran it 4 times (windows needs a few times restarted to optimize itself)
My boot times were 28-32 seconds
My startup times are between 16-22 seconds...
I havent optimized the drive, I haven't taken down any of the services yet or even reduced the size of Xp's foot print.
I purely just wanted to see what all this was about, it is definatly worth it. I can't wait to disable iExplore.exe and embed my GUI.
Thanks guys for the indepth instructions, everyone else planning on doing this it took me a night (2 hours to research and read up about this and 2 hours to complete it, building XP-installingXP-Re-Config using Minlogon)