If you require a nuts and bolts guide to how to use all the facilities available in Lightroom 3 then look else where. Do you need to know how to improve your workflow and how to replicate effects over many different images then this is not for you. Interested in slideshows and how to create web galleries then... kind of a pattern developing here.
The image you take on your digital SLR is what is important here and what you wish to do with it. David du Chemin opens the door and invites you to play and create, searching for what is important to you within your images. Nowhere does he say "This is what you do" but it is all about what you want do say with your image and he does explain what tools are available and how they can be used, illustrating these with 20 examples of his own work and how he achieved the end result he wanted. All in all, he asks you to think - dangerous stuff - so enjoy and see what your vision and voice have to say.