I've checked in my eXist/Restlet integration into a project called 'existdb-contrib' on Google's code hosting. You can read about it at:
http://code.google.com/p/existdb-contrib/wiki/Restlet The project home is: http://code.google.com/p/existdb-contrib/ There isn't much change to this project except that it should be easier to build now and it has an official home. The code lets you run the embedded version of eXist and then access it through Client calls. --Alex Milowski
