Interesting troubleshooting tools that embedded in Windows XP CD

There are a few interesting troubleshooting tools that are not installed in the default installation of Windows XP. If you have the installation CD, you will find them in the \Support\Tools\ directory. Just run SETUP.EXE in this directory to install them.
Here are a few examples:
diruse: This utility shows you the disk usage of your drives
dupfinder: Identify duplicate files, so you can free up disk space
getmac: A simply utility that will tell you the MAC address of your NIC (network card)
netdiag: Tests and diagnoses your network components
pviewer: Shows you a list of processes, and allows you to see how much memory each process uses, and to kill
processes individually