Hi Carl, nice links.
I'm the person at UNED who works with and improves the aLF User Interface (aLF is how we call to the UNED dotLRN main instance). One of my goals is to use some AJAX, not only in dotLRN but in OpenACS as well. Of course, I'm concerned about accessibility, so I'm working now with Zen.
It would be nice to keep in contact and talk often.