The ELK Junior Arduino Uno case is equipped with a number of excellent features that include a custom moulded section for the LCD JEMshield++ together with a keypad, backlight, beeper, 2 relays ...

OMC's H19 fiber-optic shield has been adapted as a stackable add-on for the Arduino Uno. ... over optical links and offers monitoring capabilities via an Arduino serial monitor or a 16x2 LCD shield.

I missed this one before, when it was announced at Electronica: the Uno SPE Shield, created by Arduino and Microchip working together. It turns out, though, that it wasn't available back then. And it ...