Most of the work in this came from getting the software to talk with the arduino and making a protocol for the data to be passed over. As for the hardware aspect all that I used was two servos (Parallax standard servo here.) A Sparkfun Arduino ProtoShield and an Arduino Duemilanove with ATMEGA328, but most of these parts can be substituted with similar items.
I thought up this project as part of a RC system, but setting up the communication took a lot of time. If anyone has any improvements, ideas, or bugs please feel free to comment.
EDIT: I wrote this awhile ago, just got to publishing it recently.
Step 1: Things you may need...
1. Arduino board (you choose)
2. two (or one) servos
3. jumper wires
4. Visual Studio 2008 Express -- link (optional)
5. Arduino IDE -- link
Sorry Linux and Apple fans, my program only runs on windows for now, but you can still manually send serial commands to the arduino without changing the code.
Step 2: Connect the hardware.
Just connect one servo to pin 9 and the other to pin 10.