Apple Aperture is designed from the ground up for professional photographers, Aperture provides everything you need for after the shoot, delivering the first allinone postproduction tool for photographers.
Featuring a RAWfocused workflow, Aperture makes RAW as easy as JPEG, letting you import, edit, catalog, organize, retouch, publish, and archive your images more effectively and efficiently than ever before. From capture to output, you work directly with your RAW files, never having to first convert them into another format before viewing, adjusting, organizing, or printing them.

And with the most powerful image processing in the world, Aperture is fast whether youre working with RAW, JPEG, or TIFF images. It supports the RAW formats from all leading digital camera manufacturers (including Canon and Nikon) and provides optimized support for such market leading cameras as the Canon EOS 1Ds Mark II, Canon EOS 20D, and Nikon D2x as well as the highly popular Canon Digital Rebel and Nikon D50. It also supports the Adobe DNG format.

Requirements
Intel
Mac OS X 10.5.8 or 10.6.2 or later.
1GB RAM (2GB or more recommended).

Link for more information: http://www.apple.com/aperture/