ADAM (Active Directory Application Mode) used as a Role provider in Sharepoint

http://blogs.msdn.com/scaravajal/archive/2007/10/23/sharepoint-2007-and-adam.aspx

 (via http://blogs.msdn.com/mskumar/archive/2007/10/24/active-directory-membership-provider-and-sharepoint.aspx)

http://www.sharepointsecurity.com/content-183.html