(and various other variants)
To benefit fully from YUI module sandboxing, we should register all of our Modules in the Y namespace, and we should take the opportunity to agree on a codified specification for this.
I've created a proposal at http://docs.moodle.org/dev/YUI/Namespacing to begin discussion.
This is essentially:
I went for Y.M, rather than Y.Moodle to keep the length low.