does doug williams' book offer anything additional

[Marty]

To clarify the above and to forestall the inevitable polygraph trolling, knowing about the polygraph's flaws before I took one is not something I can "blame" on Antipolygraph.org, since I'd learned about the shortcomings in my Psychology undergrad days.

Skeptic

Skeptic,
As you say, Antipolygraph.org isn't the only place (though it is the most accurate one on the web AFAIK) that polygraph information can be had. There are also trade texts available which people can use to verify methodology though they obviously have a different view as to the utility.  

In a way it's sad that, like some other psych tests, knowledge of the test is considered to degrade it's utility. The Rorschach test is one such once widely considered outstanding that is now very much in dispute.

-Marty