AIGLX, wow, what a shiny waste of time. When will you guys realize that what’s missing in Linux is not cool visual effects but solid applications and hardware support. That’s where you should shine.
Who cares if I can play a video on the edge of a cube when there is no decent Video Player on linux (but plenty of competing crappy ones) or make my window fade away like a paper napkin caught in the wind (when there is no decent RSS reader, application launcher or enterprise groupware solution). RedHat, wake up, grab the mono rpms and start building apps.
That should be your secret project.
Update: Healthy discussion in the comments section.