Gtk-XEmacs - Towards a GUI XEmacs
Original project page; has since been merged into XEmacs. Project to replace the existing toolbar/menubar/scrollbar implementation of XEmacs with a modern toolkit (Gtk). It will also allow manipulation of the widget set directly from Emacs Lisp.
Robin S. Socha's XEmacs Settings
Suggestions how to make XEmacs look different compared to the standard distribution.
The Emacs Schism
How XEmacs (Lucid Emacs as was) came about, by Jamie Zawinski: '[t]his incident has become famous as one of the most significant "forks" in a free software code base'. Edited Highlights of mail-lists as events unfolded.
XEmacs
The official homepage for XEmacs: The next generation of Emacs. Its emphasis is on GUI support and an open software development model. Sections on: About XEmacs, Getting, Customizing, Troubleshooting, and Developing.