From Darkroom to Lightroom (2nd ed.)

Even though Adobe's Lightroom is far from complete at the time of this writing and will likely have "many" (Adobe's word) new and changed features by the time it is released, it can make a major change to your workflow right now. And while it's still in beta, it's free. Furthermore, although unfinished, the product is extremely productive. It will do quite a bit more than Camera Raw and, at least in the Macintosh version, performs its tasks at several times the speed and with a lot more workflow