I think if the guitar is well shielded the body grounding issue may be a moot point. I use aluminum HVAC tape on the back of my pickguards or covers, and to shield all around the inside of the cavity. The idea is to create a Faraday cage around the electronics so that they don't get RF interference. The "cage" should be continuous with the ground as Drashkum says.
What the article pointed out is that your body's proximity to the guitar also cause hum:
"When the guitar player touches the strings, does the hum stop? This indicates that the player’s body is acting as one plate of a capacitor.
The capacitance between the body and power wiring adds to the capacitance between the guitar and power wiring, increasing the level of the hum transmitted from the power wiring to the guitar."
The "cure" for this is to ground your body much the way you would wear an anti-static ground strap when working on sensitive electronics.
I am guessing this is not really an issue if the guitar is well shielded, but I don't know for sure. This is the first I had heard that I might be acting as one plate of a capacitor ;-)
(I noticed the link to the article was busted...hope it's fixed now)
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