I was introduced to a fantastic new service by some fantastic students from the UFJSchool called ThingLink. Basically, it allows you to add links to an image with icons. This can be used from everything to teaching how a photo was taken to explaining a complex document. Check out my first ThingLink below of the basics of designing a spread.
So take a look and hover over the image to discover new links that can help you with design.
I think there will be many more of these to come.