With a topic that harks back to computing science theory at university, user "tolleyw" has described how to create Arduino-powered nodes for a Distributed optical Harvard Architecture system. With two or more of these nodes "a small distributed computer can be implemented which uses one node for sending instructions, mimicking input and the instruction set to manage it, and another node which will act as memory".
All the required Arduino sketches and design notes are included, so if this is of interest, check out the Instructable. And for more, we're on twitter and Google+, so follow us for news and product updates as well.
If 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: