I've checked a version of Xgl from August that was in the wild into CVS, and I'm using a glxcompmgr that also escaped at the same time. These are the last code drops that got out before the whole Xgl private development started.
The only major thing of note is Xgl no longer needs to be have xglxserver enabled on configuration, it should work with just --enable-xglserver and make install is necessary.
I'm not really in a position to help others bring this up, I don't have much use for testers to tell me things are broken unless they can fix them themselves in which case you they'll be able to bring the whole lot up themselves from CVS and instructions that are lying around (it's what I've had to do)... I'm on IRC if someone has a clue and wants to help out.