Listen to hear what's being said rather than thinking up your response.
All of this was great advice, but this one especially gets me a lot. If I find myself about to interrupt someone or waiting to talk as soon as they are done speaking, I know I'm back in a rut of listening to respond instead of just listening.
Another piece of advice I picked up from a book about listening. After someone says something, it's not always good to respond with a "me too" story and put the focus on yourself. It's often better to ask follow-up questions about their story.
I think we all do it, especially with slow talkers, people who aren't very interesting and other such individuals. I do it from time to time but try not to, especially at work.
Yep, that last point you make...that's a good one for sure. It's good in business and also social situations.