Desktop Publishers Idea Book by 
Real World Scanning and Halftones by 
Desktop Publishing for the Writer: Designing, Writing, and Developing by 
Adobe Creative Suite 5 Design Premium How-Tos by 
About.com features many free online tutorials on all aspects of page layout and using desktop publishing software.
CreativeCommons.org allows you to search Creative Commons-licensed images, music, videos, and other media for use in creative projects. Search for images that you can "modify, adapt, or build upon" for resources to use in publishing projects.
Go here to learn more about using Creative Commons-licensed material.
