This is a wonderful tutorial: quite up to your high standards. I'm personally fortunate that you've chosen to write about macro just as I've been exploring it. It's been a huge help to me.
In the "Sharpness and control" section, where the image of the remote is referenced: "remote switch or shutter release device (above)...." I'm being too picky, no doubt, but maybe someone would assume a simple remote would be inadequate. Perhaps worth changing "above" to "for instance, the one shown above"?
In the same section:
Alternatively, setting the camera to a 10 second self-timer mode can also minimize camera shake, but this approach doesn't have the advantage of freezing the composition because the shutter button still has to be pressed.I don't understand this: does this mean doesn't freeze the composition at the time the button is pressed?
In the "focusing and DOF" section, would it be possible to link to the DOF section in the macro lens tutorial, rather than the vanilla DOF tutorial? It would be more useful, I think.
In the same section, first sentence after the wonderful picture of the ants: "Fortunately, the location of sharpest focus appears much more pronounced when the subject is under high magnification." I assume this means, "more pronounced in the viewfinder," since otherwise it wouldn't be "fortunate."
End of that same paragraph: "In addition, special equipment may be needed in order to improve focus control:" Instead of "may be needed," maybe say, "can be very helpful"?
In the "optimal aperture" section, is the recommendation for f/11 - f/16 for 1.6 crop, full frame, or both? With the variation in pixel density, maybe f/11 - f/16 is a good overall rule of thumb for both.