It get's better. This is what one person from the publisher thinks about finding the book in Google's cache: "We will ask Google to remove the cache although the chances of anyone finding the book on the cache are slim. We do not believe there has been any loss to you from the book being available in such a limited form."
By now the direct link has been disabled. However, via Google's cache the whole book is still available. Does this mean that Google illegally downloaded a copy of a copyrighted book?
Access to books via the site is still not protected. Not only can you download our book, but also books from other authors (http://www.google.com/search?hl=en&q=site:chapingo.crcnetbase.com+bioconductor+gentleman&aq=f&aqi=&oq= shows all BioConductor related books by Robert Gentlemen with unrestricted access to the copyrighted PDFs). The text has also been added to Google's index (http://www.google.com/search?hl=en&source=hp&q=affymetrix+nlcv&aq=1p&aqi=n1g-p2g8&oq=affymetrix gives a link to a chapter of our book). Furthermore, the PDFs made available via this site have no restrictions when looking at security settings in the PDF's document properties.