Agile Estimating and Planning is the best Agile book I've read and I find myself constantly referring to what I learned from it in my working life. It's a journey that starts with "Why Planning Fails" which sounds like a bizarre title for a section in a book that’s about being good at planning – but read it and trust me you’ll be familiar with the stories - and it finishes with "Why Agile Planning Works" to complete the circle. The explanation of why planning fails, which perhaps is really about why "traditional" planning fails - gets the reader hooked; topics such as "activities don't finish early" and "we ignore uncertainty" report the stark reality of just how bad planning can be and how these are such obvious mistakes. But at the same time this introduces the principles for good planning. What's really great about this early part of the book is that these principles can be applied to situations that we might not class as agile – they are just good general practices. It also has an introduction to Planning Poker which comes packaged with a whole philosophy related to anchoring – anything that is prejudicial in the planning process.