Australia

Australia is currently the world leader in the recognition of the soil carbon opportunity, and the development of carbon markets that include soil carbon.

Amazing Carbon is Christine Jones's site with lots of good papers and presentations. A good place to start is this 4-page pdf file.

Jeff Baldock's slideshow on soil carbon accounting and measurement

Some of Michael Kiely's blog sites:

http://carboncoalitionoz.blogspot.com

http://soilcarbon101.blogspot.com

http://soilcarbonmyths.blogspot.com good article rebutting common myths about how soil carbon is too variable, too difficult to measure, unimportant, etc.