I kinda gave up on windows xp cause it just wasn't worth it I might look into it again some time but I don't think its really necessary cause WGA was yesterday today is WAT even thou a lot of people still use windows xp. I would look at the VLK edition of xp on the forum under Windows xp...
VLK is really bad move keys get blacklisted where as tattooing DMI area is dead easy also some motherboards already come with DMI SLP 1.0 strings. Also if you look around the net you will see VLK versions but they have WGA hack and these need updated every other month. Do as you said have a look at XP OEM SLP you will never look back, if you are talking hack rather that OEM SLP it ain't worth it.
I have been using a very old application called xpy. It gives you a chance to prevent xp doing a lot of things you do not want it to do. You need to get an older version, not a new one. The old ones give you more possibilities, which are no longer available on the newer ones. I had mine installed several years ago, set it once and it still works perfectly.... It is made by whyEye.org
Yea I really admittedly don't have enough experience with hackin the WGA so pretty go the OEM SLP route. When I was doin the research on whether or not to have a go at it I just didn't cause Windows xp is kinda old even if a lot of people use it I like Windows 7 more.... I was using TinyXp thou before this thou so I think thats still good but not quite sure....