You know what, if you wrote such a book I'd buy it. A lot of the computer books on the shelves are nearly worthless. Storage Area Networks for Dummies, anyone?
Actually I've thought about it. :-)
And I would recommend it to my clients.
However, as I found at the client I mentioned, quite a few people were given administator access to their PC's, thus negating any protection. The only thing it really prevented was the clueless clerical staff from installing spyware.