The ADMX Migrator is a snap-in for the Microsoft Management Console (MMC) that simplifies the process of converting your existing Group Policy ADM Templates to the new ADMX format and provides a graphical user interface for creating and editing Administrative Templates. The new XML-based format includes multilanguage support, an optional centralized datastore, and version control capabilities.
You can select multiple ADM files for conversion. The ADMX Migrator creates a unique namespace which you can rename and will display a warning if a collision is detected due to duplicate names. Also, any items that cannot be validated against the ADMX schema are preserved in an Unsupported section. Please note that any annotations in ADM files are removed during the conversion process.
Additionally, the ADMX Migrator provides an ADMX editor with a graphical user interface for creating and editing Administrative Templates. You can select settings from menus rather than entering them manually in a text file, speeding template creation and reducing the chance for error.
See http://www.microsoft.com/downloads/details.aspx?familyid=0F1EEC3D-10C4-4B5F-9625-97C2F731090C&mg_id=10050&displaylang=en for more information and the ever important download button.