Black on White – White on Black
This tip was also applicable in OS X Leopard and is still continued for Snow Leopard:
Black on white is just a normal screen:

If you want to invert the color of the screen to White on Black, just go to System Preferences>Universal Access>Display

Or you can do the keyboard shortcut Ctrl+Option+Cmd+8 and you will get this.
Cheers!!
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