Australia

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.