Listen - I know for me, I have yet to do this. I have yet to plug myself into an audio book or a podcast. What I have done in fact is connect to some of HFI's webcasts on some of the topics I find interesting or relevant to what I'm currently doing. Video is just as effective a learning tool as audio as visual examples can really hit home what is being explained.
Associate - We have a local usability community that meets every month. Unfortunately, I was told by a colleague that I missed the entire year and I am guilty for not following this principle. It is in a physical forum that we learn the most from. There's nothing like telling a story and listening to them to impact others around you whether you're in a job or in your own business. This goes for success-thinking - if you want to be successful, associate with like-minded successful people. I also find it to be quite fun.
As a lesson then, continuous learning and growth is crucial to anyone looking to become successful. As an example, I heard that the GE corporation has been known to be one of the most advanced companies because of their expenditures on human resources and learning. Most people that come into the company are in fact retrained so they can "unlearn" what they've learned in traditional schooling.
Talk about assimilation to the extreme.