On the XP CD in the \Support\Tools directory, there are a lot of additional support and troubleshooting utilities.
You can run SETUP from that directory to install them.
Just a few are:
diruse Shows Disk Usage
dupfinder Finds Duplicate files
getmac Get's MAC address of the network card
hostname Shows the host name of the computer
netdiag Diagnoses a variety of network components
pviewer Show a list of process and allows you to get a memory detail or kill any process
windiff Compare files and directories