Adobe Photoshop Lightroom is a really great program for photographers. In essence, it is a streamlined image editing and data asset management (DAM) application. If you shoot RAW and work with lots of photos; i.e. weddings, special event photography, or just a passionate hobbyist, you should definitely check out Lightroom. There is a bit of a learning curve, but if you take the time to get through it, you will find editing multiple images to be a much more enjoyable process. Here are some good resources for working with Lightroom (I will update as I find more):
Official Adobe site for Lightroom. You can download the 30 day demo from here.
Nice writeup on working with multiple Lightroom catalogs; one on a laptop and one master catalog at home
Tips and advice from the developers of Lightroom.
Suggested Lightroom catalog settings
Lightroom 3 is currently in beta. There are already a number of resources available for it.
Download the Beta version
Info about Lightroom 3
Photoshop Tutorials by Mark Galer
Julieanne Kost is an Adobe Image Evangelist. She has nice videos and write-ups here.
Blog about LR and related matters