<p>Is there any known way of listing the WMI classes and their properties available for a particular system? Im interested in a vbscript approach, but please suggest anything really :)</p>

<p>P.S. Great site.</p>

I believe this is what you want.
WMI Code Creator
A part of this nifty utility allows you to browse namespaces/classes/properties on the local and remote PCs, not to mention generating WMI code in VBScript/C#/VB on the fly.  Very useful.
Also, the source code used to create the utility is included in the download, which could provide a reference if you wanted to create your own browser like interface.