(Resurrecting this thread to report some research results.)
I noticed in a BIM ("Beneficial Indigenous Microorganisms") document whose URL was
posted in a thread fairly recently (
http://tribes.tribe.net/effectivemic...8-51fdf4f013ad
) that the authors had a formula for "Designer Compost" that included Charcoal Dust.
The reason cited was that it functioned as a substrate for beneficial microorganisms.
Some research reported recently on the effects of adding wildfire-produced
charcoal to various soils:
http://soil.scijournals.org/cgi/cont...ract/73/4/1173
(Cannot read the whole article without a subscription, but the abstract sums up
the general conclusions.)