Plus, the book was available before we had all the different resources on the web. I read a few years and rarely refer to it anymore but I especially liked the parts on browser inconsistencies.(my edition is dated now, but served its purpose at the time i bought it)
The version I bought in 2008/9 was already bit outdated (the 5th edition?), and I agree - I haven't really used it very much. I've learned a lot more from the other resources tlrobinson suggests. I find the Flanagan book rather reminiscent of the JS state of the art, circa 2004. I don't think it places enough of an emphasis on understanding techniques like using closures and other methods of working with scope.
