you are using ubuntu?
Open synaptic and type in the search "beryl" .
Ubuntu has a package for this.
Beryl is a windows manager like Metacity ( GNOME ) and Kwin ( KDE ) Enlightenment, etc...
A window manager is not the same as a desktop environment ( GNOME, KDE, Fluxbox, etc... ) but the way it works with the windows and the environment. ( hence the name "window manager" )
Also, by the desktop effects, it says that the effects aren't stable yet and experimental and may not work with your graphics card and even has bugs!
So I guess we'd have to wait on that one.
There are more instructions on the beryl thing in ubuntu, you have to do some extra configuring and all after downloading the package.
Use some search engine and type in " running beryl on ubuntu" or " getting beryl to work on ubuntu" etc...