Looks like a good guide. I've never done any serious mods to my computer, but my 1600XP needs a little extra juice I think. I plan on unlocking the XP and following your guide to do the volt mod.
I have very little experience with resistors and soldering them, but i think I can do this. My 1600+ can go up to about 1510-1530 Mhz with 1.85v and an SK-6. I've cooled it well enough, and it still won't go up any more. I don't really need the extra performance, I'm just intrigued and want to see how high this sucker can really go.
Thanks for the guide, and also for your other "official" 8KHA+ thread, it was very helpful.