While there are a lot of command line utilities in WindowsXP, here are some that I have been using lately.
bootcfg - Configures, queries, or changes Boot.ini file settings.
driverquery - Displays a list of all installed device drivers and their properties.
getmac - Returns the media access control (MAC) address and list of network protocols associated with each address for all network cards in each computer
gpresult - Displays Group Policy settings and Resultant Set of Policy (RSOP) for a user or a computer
netsh - You can use commands in the Netsh Interface IP context to configure the TCP/IP protocol
schtasks - Schedules commands and programs to run periodically or at a specific time
systeminfo - Displays detailed configuration information about a computer and its operating system
