Bruce Fraser’s guide to Adobe Camera Raw (ACR) software is one of the most highly recommended, and deservedly so. It is an excellent book. If you work with RAW files out of your camera and have ACR software, I highly recommend this book. This link will take you to the version for Photoshop CS3 (links for earlier versions are on the next page).

Update, March 30, 2018.

Sad to say, Bruce Fraser is no longer with us. His book was revised by Jeff Schewe for  Photoshop CS5.

If you you are using Photoshop CC, get this version by Jeff Schewe.