I have updated the DDS plugin against the latest geoserver SVN code and added a BIL format producer as well based on WCS code. I would welcome feedback and usage notes. I have tested in eclipse using a geoserver SVN build but not in a live environment. The extra dependency added is worldwind.jar which is used for dds production. Give it a whirl and let me know. It can be deployed in the usual copy .jar to geoserver/WEB-INF fashion.
The corresponding geoserver issue with .jar attached can be found here: