Adobe Lightroom beta is available for download at Adobe labs(formerly macromedia labs). Check out the introductory video here
To me, Adobe Lightroom looked like a revamped version of Adobe Photoshop album, which was launched as a free download, to join the likes of Google's Picasa. However I should say that I'vent gotten enough time to go through the video completely.Adobe says Lightroom will be a pro photographer tool. The windows version of the beta is not yet released. Only Mac download is available. I'll have to wait till windows version of the beta is available.