Keith Packard's talk was about X and the future of Linux graphics. It basically went over the history of X, kernel mode-setting, the Graphics Execution Manager, etc. No major breakthroughs from this talk if you've been keeping up with all of the Phoronix news items, but for everyone else, the nearly 40 minute video is embedded below.
Eric Anholt talked about the GLSL (GL Shading Language) compiler work they have been doing to Mesa over the past year.
Red Hat's Adam Jackson talked about doing remote graphics on Linux with X, SPICE, VNC, etc.
All of the Linux.Conf.Au talks can be viewed at Blip.TV.