The idea is great. Gain deep knowledge about the details of highly efficient Google-search-strings, then lean back and see the what people put on their websites: Excel-sheets with passwords, mail-server logs with tons of adresses etc.
I think the book tells us: be careful! Google sees, finds and caches everything you put on the web, even if you think it will not be found.
What is annoying with the book: sides full of search examples. After you have found your way through the Google search-parameters it definitevly makes no sense to cram the book full with loads of examples. Somehow I think the author had to achieve a minimum number of pages...? With regards to that, the price of the book seems high. You may visit the authors homepage to see the examples there (and much more actual searches as well).