I found out how to add enable metacity in ubuntu!
I needed it to use te awn dock since I had to uninstall compiz cause of video card problems. But whats really cool about it is that it puts drop shadows around your open programs!
To enable it enter:
gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool true
in terminal.
To disable it enter:
gconftool-2 -s '/apps/metacity/general/compositing_manager' --type bool false
in terminal.

