One of the very best ways to continue to improve and develop is to listen to audio books and trainings. You can listen in your car, while you exercise, or even as you are doing basic work around the house.
Today with digital technology, music and even audio books can be downloaded very easily. For audio books that can often mean a substantial price reduction. One company that you can use for purchasing audio books at a good price is called Audible. I haven't been using them long, but I am impressed with what I have found.
One of the neatest things is the ability for authors to have their own partner page, where they can feature their books and recommend others. Seth Godin's page is excellent. Not only are his books excellent but he recommends some important books as well.
You can check out Audible and Seth's page here:
What are your favorite audio programs?