Historic Home Inspections - Bill Kibbel, a popular speaker at conferences for home inspectors and preservation professionals. Bill has no peer- his knowledge is off the charts.
Electrical Practical Theory- An Explanation of How it All Works - Jim Katen is one of the authors of Electrical Inspections of Existing Dwellings. Jim is a great explainer of complex things. If you learn it from Jim, you can take it to the bank.
Construction Essentials. What Every Inspector Should Know Chad Fabry is NY State code certified as a Building Inspector and Fire Marshal. Fabry covers a lot of ground in his talks- be prepared to get off topic and to learn.