The article is by Derrick Story; I used to read him religiously but I lost touch with him. He's got quite a few MacWorld articles - but there's no feed. There doesn't appear to be a feed on his personal business site either. 
(Pause while we weep silently into our keyboard.)
Maybe I lost touch with him because he developed an allergy to RSS?
In any case, here's a short list of what I learned from his tutorial - despite many months of Aperture use:
- The control units are called 'bricks'.
- The White Balance Brick has a drop down for different kinds of white balance (skin tone, temperature, etc). I never $#@ noticed.
- The relationship between the histogram and the Exposure brick sliders: "Exposure (highlights, right side of the histogram), Black Point (dark tones, left side of the histogram), and Brightness (middle tones). ... Once I set the Exposure and Black Point, I use the Brightness slider to adjust for taste.... always adjust Brightness after Exposure and Black Point.
- Post brightness move highlights slider to right to recover details. (This never seems to work for me though.)
- Color tweaking. This has always been a mystery to me. He picks a green 'swatch' then uses eye dropper to pick a green item and adjusts Hue, then tweaks with Saturation and Luminance. (Ok, it's still a mystery.)
- Definition over Saturation and Vibrancy. I don't know what the differences really are, but I also like Definition most. Nobody seems to use the Contrast slider.
- When he sharpens Edges he pushes Falloff and Intensity, not Edges. (I'd been doing Edges. Again, no clue.)
- To see original image push M key (I kind of knew that).