"Whether you are teaching your students about digital citizenship or looking for images to use on your own, Flickr is a fantastic resource. This website gives users the ability to search for images that can be used for a variety of purposes without infringing on copyright. It’s a fantastic best practice for students conducting research and can come in handy for teachers looking for images to use in a iBook they are creating. If you design your own iBook using iBooks Author you’ll want to use images under Creative Commons licensing in case you decide to share your creation with the world."
Via John Evans