This is a website where you can see a digital picture-history all over a world map. You can choose a time period and/or place to view, and you can add your own pictures to a place.
This is my favorite "find" from summer academy! It is like an on-line textbook with interactive links to images, videos, audio clips and primary sources.
An 85 page document that is a "road map" to one state's social studies curriculum. The 7th and 8th grade sections might make a good starting point for Arizona's standards, if they could bear to change what they have now.