Adobe announced today a public beta of new digital photography workflow application. Though still in the beta stage, this is a very promising program and it is avilable for free download http://labs.macromedia.com/technologies/lightroom/ during the beta process, currently available for mac only. The windows version coming soon.
NAPP The National Association of Photoshop Professionals has setup this resource for lightroom, check it out at http://www.photoshopuser.com/lightroom/index.html
other resources include:
http://blogs.adobe.com/jnack/ Blog of John Nack, Senior Product Manager, Adobe Photoshop
http://www.luminous-landscape.com/reviews/software/lightroom1.shtml Micheal Reichmann's first look primer.
http://labs.macromedia.com/technologies/lightroom/video/ Lightroom Beta 1 Overview Video