VOICETHREAD is an underutilized web 2.0 tool having vast applications to accompany your imagination and creativity. In the Voicethread above, I have posed a question for history homework. This simple posting would compel students to think about the relationship between the two photos and quotations. Together they paint a picture of paradox for the time period. I believe the Global History students would get it.
Homework could require them to post a comment along with making a Voicethread of their own on the same time period. A class full of Threads, would weave a tapestry of discussion as varied as the students themselves . What a wonderful way to foster understanding.
If we can get our students to the level of engagement, where they feel the assignment is "theirs" not the teachers, then you are a success. Engaging activities like this create an atmosphere of contribution. Collaboration and discussion would ensue.
Check out the "library" of educational ideas at Voicethread: http://voicethread.com/library/
When you sign up, be sure to check the "Educator" version -- It's a better choice.