This is something most people shouldn't have a need for by now. If you were going to install SP2 I'd assume you would have done so by now. Then again there may be some corporate networks that haven't updated for whatever reason. There are some consumers that have refused to install this service pack. I personal feel this is a big mistake.
Either way this information is extremely useful and I find it helpful. So there is definitely no harm in giving this updated version of the process a look.
Paul Thurrott's SuperSite for Windows Slipstreaming Windows XP with Service Pack 2 (SP2)
PC Help Tips Tricks and Mods pc.iggyz.com