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I have read this book cover to cover in just a few commute trips: it is indeed a fascinating reading to discover the ingenuity that hackers employ to abuse on-line games, sometimes for profit, often for fun, and the privacy-invading counter-measures games companies put in place. An eye opener for anyone playing on-line games who would not be willing to share all his private information with vendors.
A very good introduction to Erlang, which really invites you to start building resilient and parallel applications. I was amazed to see the similarity between Erlang's pattern matching philosophy and RuleML's.