I found this great info-graphic about how to choose the correct Creative Commons license for your project. I thought it was spot on for information and thought others would like seeing the decision tree presented graphically. The illustration walks you through a few questions that quickly help you see which CC license will work for your project.
Creative Commons Australia published this, but from what I can tell this flow works with US as well.
More information about Creative Commons License:
Choose and create machine readable metadata and code to display your CC slug: http://creativecommons.org/choose/