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I've just switched to a double-display configuration, and I still make mistakes regarding which is the current active (focused) application. Is there a way to get the active window to be highlighted?

(Or for example, have the other windows automatically turn transparent?)

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up vote 2 down vote accepted

You can always press CmdOptH to hide all other applications, or Opt-click an application's Dock icon to hide all others.

Isolator allows to dim and/or blur background applications, as well as several other effects.


Mosaic effect

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Isolator is awsome, just what I was looking for. Thanks! – Ovesh May 29 '12 at 4:45

You can use FnF10 (unless configured for something else) to make the current application's windows stand out, in an Exposé like manner. The Fn needs to be pressed if you don't have access to F-keys enabled by default.

See under System Preferences » Exposé and Spaces:

Here's the effect for one application window:

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