Yeah, my copies of Windows XP are all valid and original, but I don’t appreciate M$’s evil plot to manage my system any more than the next guy. This is amusing:

Microsoft “Genuine Advantage” cracked in 24h

Before pressing ‘Custom’ or ‘Express’ buttons paste this text to the address bar and press enter:
javascript:void(window.g_sDisableWGACheck=’all’)
It turns off the trigger for the key check.

Even more amusing is the amount (or lack) of time it took M$’s efforts to be so easily overcome.