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Nothing you cannot find in the average library. 
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I don't know about that, most of the stuff I find in the library is pretty outdated. I think my library just sucks. For instance on books about medicine, they are pretty old. Self-help stuff if pretty timeless though, as far as psychology goes.
One of the benefits of AR's stuff is that he puts it all together in a nice package, for those that don't have a lot of extra time to spend hours researching and filtering at their library. I think that is one of the main reasons he is popular. Most people don't have time to spend in the library every day.