i went from corp to home, just wanted to try it out. i was really happy with both since i'm just a regular user. 1 thing to note is that you won't be able to run gpedit.msc with xphome b/c it doesn't contain that feature.
also, if you don't have a lagit cd key for your xp home, after you stall SP1, it will ask you to re-register your copy, which is a pain in the butt
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