Glade was written by Damon Chaplin.
The Glade home page (http://glade.gnome.org/) provides basic information, features list, download, links to the email discussion lists and related packages, and a list of the many applications developed using Glade.
The Glade Reference Manual is being written by Michael Vance. Damon Chaplin has put together the Glade FAQ and Paul Drongowski has put together the Glade Turbo-Start guide. All three documents are available directly in Glade from the Help menu (only for the Gnome version of Glade at present but this may change).