Happened across this in a LangaLetter. It’s supposed to work for any NT-based system (NT, XP, Win2K).
Offline NT Password & Registry Editor, Bootdisk. Note that it can/will screw things up if Encrypted File System (EFS) is used insofar as the encrypted files will be unreadable until you recall the original password.
Also listed: Trinity Rescue Kit – a Linux-based toolset which includes networking support and tools to make use of the network and it supports NTFS.
Check out the article … it’s got more tools (application-level password tools, for instance) as well as links to other sites and searches for more.