I get a few password removal jobs and it would be nice to not have to dig out a non-scratched cd of winternals.
Indeed, UBCD is excellent, and if you use Grub as the bootloader on your USB drive, you can have it load the UBCD iso without having to modify it - so you no longer have to worry about scratched CDsUltimate Boot CD contains 'Offline NT Password & Registry Editor' which basically lets you blank the password for an account. I've used it countless times and it hasnt failed yet (from Windows XP to 7).
You can get it on its own if you look on the net though.