Dan Diephouse recently did a presentation at QCon on the Atom Publishing Protocol and how it can be used to build enterprise services. The Atom Publishing Protocol is built on the popular syndication format, Atom. APP provides a RESTful approach for building services which is based on the concepts of collections and resources. Many applications can be broken down into this model and take advantage of the ubiquity of the Atom format for their application.
Download it from http://netzooid.com/presentations/atompub_services.ppt