Hi Richard and Howard,
We've been struggling with the same problem, having trapped ourselves in Questionmark. The latest version of this, 3.0, exports in IMS-QTI format.
We've created two XLST which translate best of fives (one best answer) and multiple true-false questions from IMS_QTI to GIFT. I've just uploaded about 1000 questions using this method. We'll try to tidy these up, and also finish the XLST for extended matching questions.
Currently it is a bit of a palaver, but if there is anyone who wishes to take on the integration of this in the quiz module they are more than welcome!
I'm using Perception and I wish to import my question into Moodle, so I'm interested in all the application that can do that.