I would recommend starting here:

MSDN ADSI Reference

and browsing the object model to see the various properties and methods of each ADSI object that can be used.

Somewhere on MSDN (couldn't find the link in a quick search - sorry!) there is also a downloadable ADSI SDK, which includes all the helpfiles and documentation, so you can read it locally, if necessary.

Hope this helps.
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Breaker