Arduino Shields
This Tutorial is Retired!
Note: This tutorial is for reference only. Most of the shields covered in the "Shieldstravaganza" video series and section are no longer carried by SparkFun. For an updated version of this tutorial, follow the link below.
View the updated tutorial: Arduino Shields v2
jimblom 
Resources and Going Further
Now that you've got this knowledge under your belt, you can bend just about any Arduino shield to your will. If you're interested in further exploring the world of shields, check out the Arduino Shield category on SparkFun. Shieldlist.org has an awesome list of shields as well.
Are you interested in exploring more about Arduino programming? Consider checking out some of these tutorials:
Here are some fun project tutorials, which are especially focused on using an Arduino shield:
Thanks for reading! Enjoy your header'ed shields!