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This app is a simple interface for Google Chat, allowing audio/video chat sessions with your contacts. Used in a separate window I keep it open on my Chromebook to the side of the screen.
I love streaming audio from the Pandora service, and this app puts a decent interface in Chrome. I run it in a window and minimize it while working.
Bonus Chromebook Tip
The Chrome OS has a full suite of keyboard shortcuts, so many it is impossible to remember them all.
Here's a great tip for Chromebook owners: Hit CTRL-ALT-? and an onscreen representation of the keyboard appears.
Hold down the CTRL, ALT, SHIFT key to see what each key invokes when it is pressed.