Awesome.
There are some NKS-related stuff from Stephen Wolfram in other formats like video and podcast at his website https://www.stephenwolfram.com/publications/?cat=new-kind-of-science but not the book itself.
I think that somewhere else on the web, someone had posted a recording of the book-talk he was giving in 2002.
The book is easy to read.
I would not recommend that. The book is about 50% images.
