The Ask the Directory Services Team blog has a great post on the top 50 KB articles used to solve issues in Directory Services support during the first quarter of Microsoft fiscal year 2008 (July 2007 through September 2007).
I list the top 10 below, but you can see the whole list after the jump.
How to remove data in Active Directory after an unsuccessful domain controller demotion
The function of Terminal Server CALs in Windows Server 2003
Windows Server 2003 Terminal Server licensing issues and requirements for deployment
Error message when you run the Active Directory Installation Wizard: "The version of the Active Directory schema of the source forest is not compatible with the version of Active Directory on this computer"
Using the BurFlags registry key to reinitialize File Replication Service replica sets
How to override the license server discovery process in Windows Server 2003 Terminal Services
Using Ntdsutil.exe to transfer or seize FSMO roles to a domain controller
How to rebuild Windows 2000 and 2003 Terminal Services Licensing database
You may experience network-related problems after you install Windows Server 2003 SP2 or the Scalable Networking Pack on a Windows Small Business Server 2003-based computer
"Directory Services cannot start" error message when you start your Windows-based or SBS-based domain controller
The Sean Blog : The top Active Directory Issues Great link on Sean's blog about the Top Active Directory