Be careful when showing screenshots of your work, or even code samples, that you have the written permission of the intellectual property owner. The laws can change from country to country, so check your local situation, but where I am, if the work was done when working for an agency, it will be the client, or agency, but not the actual person who did it. Without this permission, you can get in trouble.

Great post! This is a well done primer to this topic. Also, spot on on the recommended readings. Huge fan of Drucker and Newport's work.

Wow, I didn't expect this much when I was opening this post, but hey this is so amazing!!!!