Description :
Currently in alpha version, and un-released, HanDict will hopefully become a full-featured Hanzi dictionnary program.
In the meantime in can serve as a good Gtk2Hs demonstration. It is written by Jean-Philippe Bernardy.
It features
* plenty of Unicode, for displayng the Hanzi characters
* plenty of TreeViews, both true trees and plain lists, and user-sortablility as well.