PBS
Nova Online: The Lost Tribes of Israel
This site provides an exploration of what may have happened to the "Lost tribes of Israel," including a modern scholar's study of a southern African tribe with possible ties to the lost tribes.
Penn Museum
Penn Museum: Canaan and Ancient Israel
This online exhibit tells the story of these people using the artifacts they left behind.
Other
Theology.edu: Israel and the Assyrians
A history of Israel and the Assyrians, from the decline of Damascus to the fall of Samaria.