I recently completed the Understanding Active Directory course at the Microsoft Virtual Academy. This course is presented by Christopher Chapman.

What I liked about this course is that it included all the services that encompass Active Directory.  In addition to reviewing Active Directory Domain Services (AD DS), the course also includes a review of Active Directory Certificate Services (AD CS/PKI), Active Directory Federation Services (AD FS), Active Directory Rights Management Services (AD RMS) and Active Directory Lightweight Directory Services (AD LDS).

The presentation was a bit dry and I would have liked to hear some real-world examples.  Much of it was review, but a little review never hurts.