Selling iMac G4

[McApple]

I am getting ready to sell my iMac G4, and I was wondering what I have to do in order to get it back to the way it was when I got it, software wise. Reinstall Mac OS X, erase hardrive, that kind of thing. What should I do?

[cgratti]

Wipe the drive and install a fresh copy of OS X.

[McApple]

Okay, but the computer is registered in my name on Apple, right? Is there a way to unregister?