Via PhysOrg: Farmers get money for capturing carbon
Interested parties can join here:
Farmers Union Carbon Credit Program
However, the web site indicates there are no more offset enrollment "pools" available for 2008 and Spring, 2009 will be the earliest anyone can join.
If a farmer were to install some windmills, get paid for sequestering carbon, and continue farming; then the business of farming becomes much more diverse and appealing to more people.