MicroView Digital Compass
Contributors:
AGlass0fMilk
AGlass0fMilk 
Resources and Going Further
There are a many more cool projects you can make with the MAG3110 sensor. If you combine the MAG3110 with a few other sensors, you can make a variety of projects that involve location and orientation sensing.
Check out Shawn Hymel's Adventues in Science: Using a Magnetometer as a Compass and example code for ideas:
For more sensor fun, check out these other great SparkFun tutorials:
Interactive Hanging LED Array
Learn how we converted 72 lightbulbs into an interactive LED array for our conference room.
MyoWare Muscle Sensor Kit
Line of products to work with the MyoWare muscle sensor from Advancer Technologies.
SparkFun WiFi IR Blaster Hookup Guide
How to assemble the WiFi IR Blaster and program it using Arduino. You'll be controlling IR devices from the web in no time!
Air Velocity Sensor Breakout - FS3000 Hookup Guide
Get started with the Air Velocity Sensor Breakout - FS3000!