This small desktop scanner displays the contents of an SD card. This can help you quickly discover if an SD card is mostly empty, if it has certain files on it (jpg, txt, ino, etc.), or even if it still works. It is quick and easy. Simply plug it in and leave it on your desk. If you need to scan a card, slide it into the slot and watch the screen.
The case, made of LEGO, holds the Arduino microcontroller, an SD card reader, and a rat's nest of wires. The 16x2 LCD screen is mounted to a tower sitting on top of the main case. The downward-pointing triangle is merely for decoration on the front. The Arduino power supply comes in from the side.
There is, as in previous projects, a more detailed write-up on my site here.
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