Aperture

Aperture is Apple's photo-processing app. Aimed squarely at the professional photographer, it offers powerful photo manipulation tools, as well as easy importing, organising and archiving of your photos. Aperture's workflow is where it differs rom other rivals (ie. Photoshop) - organising your projects is much more intuitive, allowing you to group photos into sets, and compare, duplicate, and alter photos, without affecting your original files. The interface is nice, too, although slightly reminiscent of Kai's Power Tools. (btw, don't go looking for a page curl filter, it's not there.)