Now you can opt-out of having phone books delivered!
You do have to provide them with both a working email address and phone number, apparently instructions come via email and they confirm by phone. Still, I can't remember the last time that I used a phone book. DexKnows.com generally handles things for me.
http://www.wired.com/epicenter/2011/02/send-yellow-pages-to-hell/
http://www.yellowpagesoptout.com/
http://www.wired.com/epicenter/2011/02/send-yellow-pages-to-hell/
http://www.yellowpagesoptout.com/

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I recently threw one away in my car that was 5 years old.