How Search Engines Work, by Mike Grehan: “This year (2012) it will be ten years since I wrote the second edition of a book about search engines called Search Engine Marketing: The Essential Best Practice Guide. I decided to revisit it recently. Writing it was very difficult because there was nowhere near the amount of information available about the inner workings of search engines and information retrieval on the web back in the day. So once I finished it, I breathed a sigh of relief and have very rarely ventured back into its pages. Even now, I frequently meet people at conferences who bought it and still regard it as a useful resource. And surprisingly for me, having just re-read the most important parts of it, I also find a lot of it to be as relevant and fresh now as it was a decade ago.”