Build an SOE for anyone

Is it possible, while I’m on the subject of images, to remove all company information and user info from my machine before, during or after Sysprep? I am using the mini-wizard with a Sysprep.inf answer file (Automated except for Company name and computer name.)

Essentially I want to go thru the rigmoral of building a crisp and clean image for XP etc. only once, and be able to take it with me elsewhere, and put in a different serial number in the mini wizard and different company name, and noone knows any different bar me.

Is this legal? Is it all good? Would make life a hell of a lot easier for working in many organisations.