Nice write-up on how to use an LCD display (the simple one color ones) for an arduino to output information from a PC as an additional display. This could come in handy with headless PC’s, or perhaps a RPi project that you do not have room for a full sized LCD. My 2 cents, the author uses an arduino clone, I would cheap out and just use a basic Amtel.
http://runawaybrainz.blogspot.com/2013/12/arduino-lcd-smartie-oled-project.html