Continuing the train of thought I started laying out last night, I have some more details about the MavenLoader client module.
The Maven JS Plugin could generate a Javascript file or replace a token in HTML files in war projects that sets up the MavenLoader in the way talked about yesterday automatically based on the war project's POM dependencies upon Javascript artifacts. I suppose this could also be a stand-alone plugin that operates on wars.
There could also be a POM configuration option whether to prefer local copies of dependencies or ones from a specified repository (repopath). The code that expands the artifacts and rolls them up into YUI Loader format could be shared between the daemon and the Maven plugin.
This would close the circle a little more for Maven developers but still not require Maven in order to take advantage of the system. It would also be a step toward building the YUI Test integration with the JS plugin that I want :)