Hope it's OK to announce this here
Just want to let people know that Qedoc has now implemented support for both import and export of Moodle quizzes (using Moodle XML format). That has quite a number of implications for interoperability.
Possibly the main implication, and one I'll be using myself, is to use Qedoc as a more efficient editor for Moodle quizzes and then export (and re-export) results to Moodle whenever occasion arises.
The Qedoc software is free to anyone who publishes their quizzes under a Creative Commons licence.
I've put together a page just for Moodlers who want to know what this is about - http://www.qedoc.org/wiki/index.php?title=Using_the_Qedoc_Quiz_Maker_as_a_quiz_editor_for_Moodle
Anyone who's like to discuss this with me or ask questions can reply to this posting or use the discussion page for the above article.