To register v. 3.3 or 3.2.1 do the following:

1) Set the date on your Mac to 3 September 2004
2) Enter S/N Name: Santa Claus and SN: S970-5000-1800-0804-U276
3) Register
4) You can now restore the date on your Mac

To register v. 2.2, use SN: 19304. You can enter any name.