A couple of MacGyver approaches:
http://www.benvelo.com/flashlightholder.htm
and
http://www.youtube.com/watch?v=HrfZhEzjWwg&feature=related
and discussed here:
http://www.bikeforums.net/showthread.php?t=374473
Having tried these plus the DX mount, the lockblocks are my preferred mounts.