Who does geospatial PDF?
I know that Adobe, ESRI, Safe, and Cadcorp all roll their own geospatial PDF files using Adobe's geospatial PDF extensions. Let me know if you or some one you know does as well.
Adobe groks GeoPDF.
Today GeoPDF files are created from software from TerraGo (naturally!), Adobe, ESRI,Cadcorp, ERDAS, Intergraph, and BAE Systems.
GeoPDF files are consumed by software from TerraGo (naturally!), Adobe, and ESRI.
Since we support Adobe's geospatial PDF extensions and are going to use them under the hood moving forward, the distinction between the georegistration techniques from an us-v-them perspective are, more or less, moot.