I'm sure there are others, but the best book on this subject I've found so far is...
Vision & Voice: Refining Your Vision in Adobe Photoshop Lightroom…
It addresses on how to get the most out of LR3's "Develop" module. The author provides 12 RAW images then proceeds to give you a detailed explanation of the "whys and hows" he used to make the image dance to his tune. You can follow his workflow step-by-step and dulplicate his results. While LR3 is the focus of the book, his explanation is "principle" based so it can easily be extrapolated for use with another software package.
Rather than asking you to endure my dronning on about the author's approach, I suggest you read the books attached customer reviews.
In a nutshell, highly recommended, IMHO.
Enjoy your day, and cheers...
Last edited by Michaelina2; 08-08-2010 at 04:16 AM.