I decided that I would try to make our upgrade from DNN 3.1 to DNN 4 as painful as possible by throwing Active Directory into the mix. I am exploring all methods, including the possiblity of using a custom method for AD authentication and DNN synchronization. So, this will be my placeholder for any valuable information/code tidbits...

Methods for Active Directory - Here they provide several methods for managing your Active Directory database via ASP.Net code. They cover querying user information using System.DirectoryServices, changing user accounts, and group management.

Active Directory Module - On DNN website - Notice: The Active Directory Module currently produced by Tam is slated to be included in an upcoming release of DotNetNuke.  It is not "officially supported" at this time, although we are clearly preparing to do so.  Please bear with us while we incorporate this useful functionality in an appropriate manner.

Retrieving User Info from DotNetNuke  - Discussion on Tam's module and Active Directory

Building Secure ASP.NET Applications: Authentication, Authorization, and Secure Communication - Microsoft on AD and ASP.Net

Active Directory and ASP.NET 2.0 Beta 2 - Did you know MS shipped an Active Directory Membership Provider in Beta 2?

more coming soon...