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If it is "printed" book sure it is "old"; during the time needed to print it everything could have changed!
It is difficult to maintain updated the monthly edition of the "UnFair Advantage Search Engine Book" edited by Stephen from Planet Ocean Communication and digitally distribuited.
Forums like this are so much better because they change daily.They are also the sub total of lot of contributors, not just a few, so you can get a feel of how sensible a technique is.
The Web is the best place to get information about the Web!
The idea with our free e-book (mentioned above), is to provide a comprehensive list of links to SEO resources - we don't discuss SEO tactics in depth.
It works because dead links are removed weekly and the updated version uploaded to the server. You can't do that with a print version.
BTW, it's called "The Mother of all Search Engine Reference Books II".