I use NoCD cracks because I have a vast software collection and cant be arsed keep switching the legitimate software I have because the dumb security systems that publishers use only effect the people who actually buy software.
I'll admit I use the corp XP at home. I own 5 keys now for XP Pro, however I just hate justifying the reformat every 6 months to them, or the upgrading of a mobo/cpu which usually forces me to reinstall xp again. Each time I used to do it would mean a call to M$ for that lovely long activation code...
So yeah, I use the xp corp disc to get around the activation because I am so sick of calling M$ with every format/hardware upgrade.