I *really* like Derek Scrimgeour's book. I think it is packed with useful training and trialing insights, presented in a very easy-to-follow and well-organized progression. Derek shares some of his own training and trialing experiences along the way, and how they've shaped his perspective. He also talks about the various dogs, both past and present, that have been particularly significant, and how the sort of dog he looks for has evolved over the years. It all makes for a very good read, not to mention an excellent resource.