I met Tim Ferriss a few months ago at the New New internet Conference organized by Executive biz. I met him in the speakers room and we chatted a bit and he is a very nice and personable guy.
His book is about saving time. i think he is an advocate of not letting email destroy your life. See his post on How to Stop Checking E-mail on the Evenings and Weekends . Despite my belief in Tim Ferriss and his book I have not become his disciple yet ( see the time I am making this post :) )
Great idea Tim to outsource the writing of your book ;)