The tools provided by Sysinternals are perceived as a supplement to the resource kit and in short they are like
a Swiss army knife of the IT department, and best of all they are freeware.
BGINFO – adds systems information to the desktop background (IP,host name etc.)
REGMON – Monitors changes in the registry
FILEMON – Monitors changes on the file system
PSEXEC – Enables the execution of commands on remote machines
For more information about the tools that are available you can view a short tour of the tools
Sysinternals is currently a part of Microsoft (the tools are still free at www.sysinternals.com ).