I have also struggled with Compiz Fusion for a while now.
I had Beryl working fine in F7.
I have gone through the install of the standard repo compiz packages, then the repo from the post from 11/2007 from leigh with the 0.6.99 compiz packages, and now the more recent post that uses the standard repo plus a couple additional packages (fusion-icon).
None have worked. Clean uninstall all compiz packages and reinstall each time.
I am running on an AMD64, kernel 126.96.36.199-137, Geforce 6600GT, and the NVIDIA downloaded drivers 169.09. I could not get the livna nvidia modules to work right at all. NVidia module is working normally (direct rendering enabled etc) other than no compiz.
Here is the error when I try to run desktop-effects:
(from the terminal)
compiz (core) - Fatal: No sync extension
Xlib: extension "SHAPE" missing on display ":0.0"
I have fusion-icon running, but nothing happens, so I run desktop-effects, and get this error. I have compiz set as window manager and emerald as window decorator.
I can post my Xorg.conf if that will help, I have followed several threads on here and put the commands in there, none seem to work.
I am rather disappointed how difficult it is to get compiz-fusion to work in F8 compared to beryl in F7, I consider myself an experienced Linux user (since RedHat 6.0).