Using Aperture to Help Register Images Here's a workflow idea about using Aperture to simplify registering your images with the US Copyright Office.
Aperture and Multiple Computers Here's a workflow idea about using Aperture with multiple computers.
Shapertures This article explains what shapertures are and how to create them yourself.
Aperture Exposed Co-authored by Ellen and Josh Anon and published by Sybex (July, 2006), Aperture Exposed is the Aperture reference. Please contact Josh for purchasing information. A free update PDF, with information about Aperture 1.5, is available for download here.
Using Photoshop CS2's Merge to HDR to Simplify Complicated Exposures
This article explains the basics of high dynamic range (HDR) images and how to create and use them in Photoshop. This PDF is free to download.