One of the goals of the FDO Toolbox rewrite was easy and flexible extensibility.
As a result of this goal, I have set up another project site solely dedicated to the development of add-ins for FDO Toolbox.
Currently things are quite bare at the moment (only a subset of the FDO Toolbox trunk and a skeleton MapGuide Add-In project are in there), but things will be hopefully picking up soon.
FDO Toolbox Add-Ins (Google Code)
Work Opportunity at Autodesk Support
3 days ago