Lovely links, Michaelangelica. A few on nitrogen fixation by "wee beasties":
Nitrogen fixation (technical)
nitrogen fixation: Definition and Much More from Answers.com
NITROGEN FIXATION (technical)
Biological Nitrogen Fixation
Cyanobacteria and soil ecology:
Biofertilizers
CAT.INIST
Bio-fertilizers for Coffee Plantations (INeedCoffee.com)
Capitol Reef - Cryptobiotic Soil
Plant Ecology Lab, Soil Crusts, Archbold Biological Station, 9 May 2002, Fred E. Lohrer. Added PDF file link 31 May 2002.
Cyanobacteria
I think the topics of nitrogen cycling and nitrogen fixation are especially pertinent, because findings often state that biochar/terra preta soils are usually very rich in nitrogen.
I wish I could link to an online version of one of my old textbooks: Brock's Biology of Microorganisms. It has a lot of useful general info on soil microbes as well as specifics on their biochemistry and interactions with plants.
Edit: Now that I mentioned it, I searched to see what is available online and Brock's isn't free on the net, but it does have useful weblinks on the textbook's website for chapter headings and related topics:
Microorganisms and Microbiology
Maybe useful for those willing to check out further web resources?
Molecular Biology of the Cell by Alberts et al.:
Molecular Biology of the Cell
Online and searchable! Another one of my textbooks which I always keep by my desk. Useful for microbial technical details.
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Logic
The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.
--Ambrose Bierce,
The Devil's Dictionary