For security reasons the app should be served from a single server. I think the best solution would be to use the new FileService in app engine to host the compiled fragments. It may be doable already by mapping a service to the .js url and serve the content from the blobstore, but it would be awesome if this could be handled automagically by the Google plugin.
-- http://groups.google.com/group/Google-Web-Toolkit-Contributors
