[manvsmachine]

raniskeet has a good point; if you've read and really understand the content of both of those, there's not too much that you'll learn from just reading more books. I'm pretty much in the same boat as you (read The Good Parts, started the Def Guide), and my next step is not to read about Javascript, but to read Javascript. Pick a codebase of something you use or want to start using and learn how it ticks.

[evangineer]

Depending on what you intend to do, you could do a lot worse than spelunk in the codebase of something like JQuery or YUI.