The reasons for winding down are three-fold:
1. My original goals of FDO Toolbox have been met. With the exception of certain esoteric bits of the FDO API, my primary design goal of FDO Toolbox being a "front-end" to the FDO API has been effectively met.
3. Now being the primary maintainer, Maestro is now my primary focus. My long-term vision for Maestro is to have the data creation, querying, analysis and ETL capabilities of FDO Toolbox in addition to the publishing capabilities of Maestro, forming the ultimate tool for geospatial data. So to this end, you will see many parts of FDO Toolbox being merged into future releases of Maestro. So in a way FDO Toolbox will live on as part of the Maestro project.
Version 1.0 of FDO Toolbox, which will have the final version of FDO 3.5.0 will be the final release. After that, I'll be moving on full-time (my free time that is :D) to the MapGuide and Maestro projects and as a result, you'll be seeing more Maestro-related bloggery in the future.
R.I.P. FDO Toolbox (2008-2010)