I can't remember if it was here I heard about it but I've been watching the Russian AMV "Reflections" which imagines what Rakka's past life might have been like, the events leading to her suicide, and it's one of the most original and moving AMVs I've ever seen, particularly in terms of its concept, that of extending the story rather than being about the actual events in the series. In fact I feel this video should be required viewing for all Haibane Renmei fans! The lyrics to the song are very bitter though, I think on the whole I prefer watching it without the optional soft subtitles, which tend to be a distraction in a music video anyhow.
The amv won 5 awards at AkrossCon2006. You can get the video from the contest site:
http://www.akross.ru/data/contest/best.html or in somewhat higher quality from
http://www.animemusicvideos.org/memb...o.php?v=135186