So I have to ask: what's preventing anyone from setting up a home SUS/WUS server (redundant, I know) and just using that to update their local/pirated XP/2k machines? Or are they just relying on the fact that most people have no idea you can do this?

-Zeke

ps: SUS/WUS servers are 'System Update Servers' or 'Windows Update Servers' - a W2k server or W2.3k servers running a service which downloads and approves all Windows service packs for a LAN/Domain. That way, if you have say, 20 XP machines, they don't all need to download the patches, it happens once then is deployed via Group Policy rules in your domain.