I have set a shortcut to hide all the windows with Ctrl + Alt + D.
But now I would like to set one that hides all except the currently active window. Is that possible?
In Windows 7 this is possible with the Windows Key + Home or by clicking and holding the title bar of the active application and "shaking" it (known as Aero Shake). As Sunstreaker pointed out, dv3500ea on AskUbunutu has a wonderful, albeit long, set of instructions to do so in Ubuntu here.
this
in AskUbuntu.