Following up on this discussion about difficulty, Z Weyand has put together an example of how 15-second difficulty judging might go. The video (7mb, mov), from my 2003 FPAW semifinal round of Open Pairs with Dave Lewis, shows 30 seconds of freestyle. A difficulty judge would write down two scores during this period. On the video, you can see the word MARK to indicate when to award your score.
Once some people chime in with scores and comments, Dave, Skippy Jammer and I will give our perspectives.