If you're thinking of picking up Apple's Aperture (or already bought it), Creativepro has an interesting look at the philosophy behind the new tool. One thing the article points out is that most reviewers don't "get" the program, analyzing the tool based on the preconceived ideas of how it should work. As an example, it takes a look at the "stacking" feature inside Aperture and contrasts it to traditional asset management ideas. The article also shows how Aperture's approach works more like a video editor than a picture editor.
Highly recommended article!
