The NIS UID Migration Scripts examine every file on a machine and checks to see if the UID should be changed, and if necessary, changes it based on a UID map. While orginally written for the consolidation of multiple NIS domains, it can be used for any type of large project that changes many UIDs. Examples include migrating to NIS or normallizing users UIDs on multiple machines.
chntpw is a Linux utility to (re)set the password of any user that has a valid (local) account on your WinNT or Win2000 system, by modifying the crypted password in the registry's SAM file. You do not need to know the old password to set a new one. It works offline (i.e., you have to shutdown your computer and boot off a linux floppy disk). The bootdisk includes stuff to access NTFS partitions and scripts to glue the whole thing together. This utility works with SYSKEY and includes the option to turn it off. A bootdisk image is provided.