Based on the comments from the previous post I wanted to offer an update. A much simpler solution is to simply activate the compositing within recent versions of Gnome.
gconftool-2 -s --type bool /apps/metacity/general/compositing_manager true
This does introduce a known bug which can break enabling compiz however. If you want to activate compiz after toggling this value, you’ll need to de-activate it first.
gconftool-2 -s --type bool /apps/metacity/general/compositing_manager false
Thanks to Christoph, Philip and Cory for this tip.