Steppers are fun, so are Arduino. Combining the two means double the fun. Here is a three minute video showing how it is done. The original blog post can be found here.
A great thing about steppers is that they are easy to find. You are likely to find them in old printers, scanners and floppy drives, as well as in photo-copiers and other machines relying on controlling the size of a motion. Another great thing about them is their usefulness – you can build robots, web cam stands and much more.