No longer are the students the professor's audience; students are the professor's apprentices.

Over at mathforum.org there is an excellent article (or would one say testimony) by J.J. Uhl from the University of Illinois how technology changed his lecture style for the better. Titled " How technology influenced me to stop lecturing and start teaching" it is a must read. He reminds us of the learning sequence that makes things stick in our minds: " intuition-trial-error-speculation-conjecture-proof."