I absolutely loved his explanation of the four patterns of function invocation. I finally understood what the this object referred to in the different modes of invocation and also learnt about the that = this; pattern. I liked his discussion of closures too although I found Nathans‘ explanation to be better.
Overall, I enjoyed reading the book and learnt a lot however I won’t recommend it to beginners. For serious web developers, it is a must-read. (well, to me :)) and I think I’ll have to reread it a couple of times to really understand it well enough.
Lastly, I think JSLint is awesome but a pain to use. What do you think?