Earlier today, prior to the release of what is said to be a significant 'Windows Update Tuesday', Microsoft introduced SteadyState, a refined tool to manage shared computers.
The tool replaces the 'Shared Computer Toolkit' and is billed as having numerous improvements many driven by user suggestions.
It is available now in the Windows Download Center.
While the documentation is a little misleading (it shows Vista as the host operating system) , the program does run on XP SP2 and SP3.
Review in brief: One of the simplest, most useful, MS-based group tools to date. Just about anyone can use this. Includes the necessary stuff (only) that your IT guy (or gal) may neglect (like turning off USB ports in a business environment!). This is a must try time-saver.