I downloaded Glade this morning and used it to redo all the dialogs for fancy-greet. We'll have a working XDM replacement sometime soon, I hope. Glade still has a few zillion bugs, but taken as a whole, it represents a major advance over designing GTK GUIs by hand.
In other news, the MathMap users mailing list is online. Send mail to email@example.com with the body "subscribe mathmap-users".