Okay, before I get into the guts of it, I'm vastly aware that Gtk and Qt are marvelous frameworks from which to work with. In fact, I have no qualms with either.
That being said, does anyone know of any ongoing projects by which X11/Xlib are to be completed libraries? Sadly, I ask this is a former Windows-Only Developer. In Win32 API, everything from the basic window to dialog boxes are covered in same API level. Whereas, under Linux basic windows, anti-alias fonts, hardware interaction are all independent libraries. Dialog boxes are still, by and large, self constructed.
And if there are no projects looking to complete X11, does anyone know of any resources by which a person could understand the fundamentals to embark on such a project?