The only contribution I can make in this discussion is in the area of my expertise, which is NOT diving. However, I AM a education professional (teacher). I am "old school" and cling to the idea that the best learning environment is a log...on one end sits a teacher who wants to teach, on the other is a student who wants to learn (the Socratic approach).
However, we in the education field are discovering that there is a new generation out there that is growing up in a completely different environment. They are much more used to getting their input electronically, and they are completely comfortable (and proficient) getting it from interactive DVD, the internet, blogs, wiki's, and other media. They are the first generation to be classified as 'electronic natives', while the previous ones are more like 'electronic immigrants'--not born into this new world, but challenged to adapt to it. (Some, like me, are even 'electronic aliens'--we're from a different world entirely and were dropped into this new one kicking and scraming!) This might, though, explain the disparate observations from some of the posters. It is entirely possible--and probable--that many new divers do, indeed, absorb the information better from electronic media. We see it all the time in our schools with these "e-natives". Good instructors will do well to adapt their teaching methods to meet the needs of these students, as well as continue to work through traditional lecture strategies that are open and engaging in order to reach the rest.
(and if a sophomore senator and "community organizer" is qualified to be PRESIDENT, then sign me up for Lord Imminence of the Western Hemisphere!)