SXEmacs, XEmacs and Emacs
You know XEmacs doesn't seem to have changed much in years. Now I hear via Dino and LWN and that Steve Youngs has started SXEmacs. Interesting. Also of note, FSF Emacs 22 includes GTK support (the first time since the GTK1 patch for XEmacs which wasn't particularly stable).
SXEmacs has all the Win32 cruft removed which is kewl. :-)