This is the best feature on the new OSX, Maverick (10.9)!

Multiple displays

< blockquote>Each display has its own menu bar, and the Dock is available wherever you need it —
no configuration required.

Now you can run an app full screen on each display.

Enter Mission Control to get an overview of what’s running on each display, and simply drag app thumbnails between them to customize your view.

well done!