Markus got his hands on some old split-flap displays from a train station and build a controller for them. The controller is based on a PIC 12F683 and is using optocouplers to isolate the 42 volts display motors from the driver circuit. The unit is able to control 8 of the segments.
DIY Split-flap display driving circuit – [Link]
This tutorial will describe a way of controlling an iPod remote, and thus, an easy way of getting some music and sound out of your Arduino project. The remote we used was an unofficial remote I found on the worldwide auction site for around 10 USD, an opto-isolator can be found in your local electronics store. [via]
Control an iPod with the Arduino - [Link]