I recently took the Old Home Certification course that is put out by Preservation Alliance of Minnesota. It was a fantastic 2 day course and we covered so much material that I had to take a day off to let it all soak in. This course had topics that included such items as: Why old homes are GREEN, House Styles, Historic Interior Vocabulary, Geographic factors behind the development of the Twin Cities, Finding old home contractors, understanding historic districts, researching old homes, marketing old homes, and much more.
You can find more information on Preservation Alliance of Minnesota at their website.