After trying several of the articles out there in the big WWW, and after several failures, I finally found an article on how to get the 3D desktop effects going in ubuntu 7.04. The key differentiation is the need to roll back beryl to a previous version so you get the beryl-xgl installed.
http://wiki.beryl-project.org/wiki/Install_Beryl_on_Ubuntu_Feisty_with_XGL
One reply on “3D Desktop (Beryl and Xgl) on Ubuntu Edgy Eft with ATI card”
http://ubuntuguide.org/wiki/Ubuntu:Feisty
Follow these guides.
I always find a clean install of drivers is the key re GLX and beryl. I am not a fan of ati cards with linux. I much prefer nvidia.