XCB included in the katamari, required by libX11 1.4 and some clients.
Documentation: Most protocol & API docs moved from xorg-docs into individual proto/library modules, converted from legacy formats to DocBook/XML where possible.
Massive amounts of configure.ac/Makefile.am cleanup & improvement. Lots of previously duplicated bits moved to xorg-macros (requiring recent xorg-macros versions when we build the tarballs, but unless you autoreconf that shouldn't affect people building from tarballs).
Most of the COPYING file stubs have been replaced with actual copies of the copyright & license notices for easier packaging by distributors who provide such notices in their packages.
Xsdl - experimental kdrive server using SDL that was never finished
Multibuffer extension in X servers - deprecated since the 90's
- RC1: 11 November 2010
- Final Release: 20 December 2010