We've set up a wiki for EADitor documentation, which you can find at http://wiki.numismatics.org/eaditor:eaditor
Documentation will be an ongoing project. My goal is to devote several hours per week to it. The next EADitor version will be released before the new year--perhaps as early as next week. There have been some significant improvements since the last release. Hard coded URLs have been removed from the code and are stored in configuration files which are easily editable (eXist URL stored in XML file on disk, Solr URLs stored in eXist with other settings which are edited in a web form). It is now easy to manage deploying Orbeon, each Solr core, and eXist on different servers.