Crockford is an excellent writer. You should check out his book "Javascript: The Good Parts" if you liked that article, it's one of the best programming books I've read in a long time.
While it's a pretty good book, I found it repetitive and filled with what I would consider somewhat arbitrary "style" guidelines (don't use increment or decrement operators? fall-through case statements?).
Also, it only covers the language, since the DOM isn't a "good part". I would recommend "JavaScript: The Definitive Guide" (a.k.a. the rhino book, which the Rhino JS interpreter is named after...). I keep that one next to my desk at all times.
But in summary, "JavaScript: The Good Parts" is a good supplement to other materials (though most of what's contained in the book can be learned from his website and video lectures)
