XQuartz Related Mailing Lists
There are three main mailing lists that relate directly to X11 on OS-X.
xquartz-dev is hosted by lists.macosforge.org as a place for developers to discuss development topics in more detail than would be appropriate for the x11-users list. Submit patches and discuss development in this list.
xquartz-changes tracks changes to our svn (mainly just libGL) and git repository.