If you happen to pass by an old Nintendo Gameboy printer (something I didn't know even existed until today) - you can interface it with your Arduino-compatible boards very easily. Using a collation of instructions and example sketches by Miles Burton, text and images can be printed with relative ease. It turns out the printer has a relatively simple serial interface, and perfect for inexpensive hard copy.
For more information, including a description of the serial protocol used, example Arduino sketch and other notes, visit Miles' project page. Or if you're interested in backing up Gameboy cartridge data, click here. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
If this sort of project intrigues you and you're new to Arduino, the first step is a solid board for your projects - our Freetronics Eleven - the Arduino-Uno compatible with low-profile USB socket, onboard prototyping space and easy to view LEDs: