FULL DISCLOSURE: I am an unabashed champion of Adobe Photoshop Lightroom. I generate personal revenue from training people on Lightroom. Readers should expect me to be enthusiastic about Lightroom. Now that the mumbo-jumbo is out of the way, I wanted to let all the members know that Adobe released Adobe Photoshop Lightroom 4.1 today. Existing Lightroom 4 users will be prompted to install the update. In addition to bug fixes and other enhancements it adds support for a number of new cameras including the Canon 1Dx, Fuji X-Pro 1, the 5D mark III, the Nikon D4, the Nikon D800 and D800e, the Leica M Monochrom, the Leica X2 as well as lens profiles for the new Sigma lenses for micro four-thirds.
At its new retail price of $149, imho there is no more feature rich and powerful image management and editing software on the market. Photoshop CS6 is certainly a powerful tool, but even Adobe says it is a designer's tool first and a photographer's tool second with Lightroom being their flagship tool for photographers. Even Apple Aperture evangelist, professional photographer and noted curmudgeon Scott Bourne is switching to Lightroom.
It's available in lots of places, online and in retail stores and comes to run on both Windows and Mac OS X.
If your photo editing software is older, or you don't have a catalog management system for your photographs and would like a great one with an integrated editor, you cannot lose with Lightroom.