SMS 2003 - Tools - WMI Administrative Tools
Most people probably already have this tool, but I use it quite often and thought that I should post a link to the download. It is VERY handy for understanding the WMI and how it is organized. Personally, I prefer this tool over many others.
http://www.microsoft.com/downloads/details.aspx?familyid=6430F853-1120-48DB-8CC5-F2ABDC3ED314&displaylang=en
Enjoy!