I'll show you how to make a neat little compact Arduino servo controller board with built in servo connectors that is perfect for costuming and haunted house applications. There are multiple code examples, wiring diagrams and I'll show you how to connect sensors and even how to connect two controllers using wireless radios.
Here's a little movie clip of what is easily possible- an animatronic Predator cannon with laser sight, cannon firing sound and head tracking motion control.
Here's an Iron Man hand repulsor with servo to open the forearm missile compartment. Follow along and find out how to make your awesome costumes more awesome...
Update: My instructable for showing how to make an animatronic Stargate helmet is here-
Note- While this instructable is written for the beginner, this tutorial assumes you know how to use a soldering iron and other assorted tools like wire strippers and wire cutters. Please be sure to take proper safety precautions, wear safety glasses when using cutting tools and have adequate ventilation when soldering. If you aren't yet comfortable soldering small surface mount components don't fret- I've posted links in the reference section that will help you become a soldering champ in no time.