K9LA has come very good tutorials on propagation on his website.
The Potomac Valley Radio Club has Webinars and some dealing with propagation.
Wikipedeia I found to be very good for information as well as great links on most any subject.
Smart flix offers many DVD's and some good ones on electronics.
Youtube has to many to mention just search electronic tutorial and the flood gates open
I have found that there also is lots of information on antennas, feed lines and RFI out there. The online course from the ARRL were a step by step learning process. It followed a building block strategy but at this time it's just not out there.
In closing I understand the ARRL is very keen on Ecomm and it is certainly understandable. The weather that has brought about permanent change to many in the world is a good reason for Ecomm. Terrorism is not just "over there" anymore it can happen right at home and thus another need for Ecomm. BUT an amateur having a firm grounding in antenna theory, understanding feed lines, RFI, propagation and some electronics makes Ecomm all that much stronger.