Active Directory integration with SQL Server Membership provider

Hi
I would like to know best resource/tutorial/video on Active Directory Integration with SQL Server Membership provider.
Using Active Directory internal users are authenticated and then same user name is created in SQL Membership database to implement authorization.
users are stored against groups in Active directory, so it is not feasible or no granular approch to assign Roles to users in Active Directory. By authenticating users against Active Directory and using SQL Server Membership provider to implement Authorization for active directory users as well as it is quite feasible to implement authentication and authorization using SQL Server Membership provider.
In simple words...
Active Directory  for internal users authentication ONLY.
SQL Server Membership provider for internal users authoriza ...