Just recently I found out that Roger von Oech has revised this ground breaking work and also he has a blog which acts as an open voice and interactive companion piece to the ideas in the book and a continued look at creativity and ways to spark, breakthrough, understand, appreciate and uncover new thoughts.
What is equally exciting is that the "whacks" resonate differently with individuals. The use of approachable stories and often taken for granted questions and their assumed answers helps to clear the path to an oasis of creative thinking.
Here is the post which motivated me to write this morning.