Dear DM-L Some readers may be interested in an AHDS information paper that we have recently released. It was written by Thijs van den Broek as part of his technical report on the possibilities of Benchmarking XML-editors.
http://ahds.ac.uk/creating/information-papers/xml-editors/
It is a highly subjective report and really concerns the perceived usability of the editors by different groups of people.
My preferred editors are tei-emacs and oXygen, by the way.
-James