Just for the record Flanagan book has a new edition covering ECMAScript 5.

JavaScript: The Definitive Guide covers almost everything. If you take the time to read it, you'll know javascript very well. Then get into jQuery (this guide looks good: http://www.rebeccamurphey.com/jqfundamentals).

My personal experience is "Javascript: The Definitive Guide" feels like a tome. It's a big, dry book. It doesn't stimulate my mind and I skimmed through most of it(chapters dedicated to looping syntax et al.).

"Javascript: The Good Parts" worked wonders for me. I understand the language and I use JQuery for dom manipulation. I understand ground-level DOM and can use it when required. Do you think "Javascript: The Definitive Guide" adds something good which "Javascript: The Good Parts" skips? There are many things but I am talking things which make you a better Javascripter.

I learned JavaScript from The Definitive Guide before The Good Parts came out, so maybe my opinion is skewed, but I don't think Good Parts covers enough material to be useful on it's own (Good Parts doesn't cover DOM APIs at all, for example).

I can tell you Definitive Guide also sat next to my desk to serve as a reference for a long time, though most of the same material can be found on https://developer.mozilla.org/en/JavaScript http://www.w3schools.com/js/default.asp and many other websites.