At the beginning of The Truthful Art I wrote that I was going to release tutorials explaining how the charts and maps in the book were made. It's taken me a while to get started, but I've just uploaded the first batch of seven videos. They deal with the example of elementary data exploration I describe in the Preface of the book (you can download the first 40 pages for free here.) I used iNZight, an R-based free tool that is very easy to learn.
To see all videos, visit the Tutorials & Resources section on the upper menu, or go to my YouTube channel. Keep an eye on either. I'll continue adding tutorials on a regular basis in the next couple of months, as I'll use them in my classes this coming semester.