The vast majority of my learning has been through participation in discussion. I found books too dry for learning, nor did I retain much from them. I also didn't handle lecture well, because things go in one ear and out the other.
I don't think you actually disagree with me. You note you didn't handle lecture well, and thats what I criticized (a guy talking and you just taking notes.) I agree with discussion being a powerful learning tool. It's one of the most powerful tools for learning, but one thats hard to afford (you need extremely small student group for each teacher to implement effectively in the classroom, or have direct conversations with a mentor.) It's also the reason why study groups are effective.
Lectures work best if you take notes, especially by hand. Note-taking prevents information from going "in one ear and out the other" because, like discussion, you activate more areas of your brain as you take notes; think of it as having a discussion with your notebook; I don't know anyone who can write as fast as a lecturer talks, so you have to be constantly deciding what to write down instead of letting your mind drift around. This doesn't just work at school. When I go to a baseball game (for pleasure, anyway, rather than to schmooze with clients), I try to get a scorecard and track every play. I've found that I remember the details of those games much better that the ones where I kicked back and drank a beer. (And I remember *any* game that I actually attended better than the ones I watch on TV, so try to actually attend class, not depend on someone else's retransmission.)
Baseball scorecards are optimized for taking notes on baseball games. Likewise, at a lecture you should use Cornell Notes, a tools optimized for taking notes at lectures. There are thousands of web site dedicated to this, so research it yourself at http://www.google.com/search?q=%22cornell+notes%22.
Finally, if you don't believe me then look at what others have to say. For example, http://brainz.org/brain-hacks/ claims (in bullet point 3) that "Taking notes by hand instead of typing them, will help you retain the information more effectively, as the pressure points activated by holding a pen are linked to the creative and memory centers of the brain." If that sounds a bit unbelievable, research reported at http://www.mpiweb.org/magazine/pluspoint/20110124/Taking_Notes backs up the claim.