As a math teacher, I never really considered copyright infringement (is that even what it's called?) as a problem. Most of my classes integrate technology through iPad applications for practice and as a resource for me to show the students new processes and skills. However, I do sometimes make PowerPoint presentations to present material to my classes, and I use pictures that I stumble upon online. I never really considered the fact that the way I was going about this may not be entirely legal. However, looking through creativecommons.org and at the blog you shared on 14 Things to Tame, I think I have a few resources to pull from for my presentations.
I also have my Mathematics in Athletics students create presentations on different sports involving statistics, physics, and other mechanics. It would be interesting for me to share the information I learned with them about citing the material and the pictures they choose for their presentations. It never really occurred to me before that the pictures on their cover pages or in their presentations belong to someone else. I think introducing them to this site will be helpful for the students and will be a useful tool for them to have at their finger tips as the move on to college next year.