http://www.ltg.ed.ac.uk/~ht/xed.html
>From the CHANGES file:
Changes from v0.2.0 as released:
Bug fixes:
 undo of attr operations fixed
 ]]a> followed by deleting the 'a' now impossible
 Resizing works properly
 window width and height fit better to available real-estate
 rule out control characters in CDATA
 allow : in names
 move menus out of the way more
 move help menu down fully onto screen
 forward/backward word at E/BOL works properly
Features:
 Modest support for progressive (depth-sensitive) indentation
 Catch most forms of window death and give you a save changes dialog
 http://... will work on command line
 Right button opens tag or attr for editing (thanks to Mike Kay for
  suggesting this)