We are in the process of releasing a page that explains how to use the logo for the benefit of the community making sure whoever downloads it understands what are the rules.
Product Photos: SparkFun product photos may be used without permission for educational purposes (research papers, school projects, etc.). However, permission must be granted for commercial use and proper credit to SparkFun must be given. For inquiries about the use of our product photos or permission to use them, please contact firstname.lastname@example.org. (via)