I've always considered book quoting the same way we considered it in college: Quote, quote, quote, but reference, reference, reference. As long as we aren't passing the work off as our own, we aren't infringing on copyright, I believe.

Passing snippets of code or text, with a reference to the book is okay, I believe. But IANAL!!!!

J. J. Horner
Linux, Perl, Apache, Stronghold, Unix
jhorner@knoxlug.org http://www.knoxlug.org/