Scott Adams put an interesting post up on his blog. The whole thing is worth reading, but I especially liked this bit:
Prior to the Dale Carnegie course I believed that conversation was a process by which I could demonstrate my cleverness, complain about what was bugging me, and argue with people in order to teach them how dumb they were. To me, listening was the same thing as being bored. I figured it was the other person’s responsibility to find some entertainment in the conversation. That wasn’t my job.