Links for AD related issues and information in technet.microsoft.com
This is the link to the Official library site on technet.microsoft.com for Windows 2000 Server. Though this is for 2000 server, it explains many concepts, diagnostics and troubleshooting steps that can be used today on Windows Server 2003 and Windows Server 2008
http://technet.microsoft.com/en-us/library/cc977985.aspx
Diagnosing and Troubleshooting Active Directory Problems
http://technet.microsoft.com/en-us/library/cc961826.aspx
Advanced Troubleshooting:
http://technet.microsoft.com/en-us/library/cc961815.aspx
Active Directory Diagnostic Tool (Ntdsutil.exe)
http://technet.microsoft.com/en-us/library/cc976711.aspx
User Rights:
http://technet.microsoft.com/en-us/library/cc976702.aspx