If you have been using System Center Operations Manager 2007 you have most likely seen the "Key Concepts & How-to Videos" throughout the UI.  There are 3 available today and about 25 total by RTM.  You can view these by clicking the links from the Operations Manager Console or visit the 'landing page' on TechNet.

http://www.microsoft.com/technet/prodtechnol/mom/opsmgr/webcasts.mspx