Video Section of this article: Great way to collaborate with an international class. compare and contrast the news story to see if it has been interpreted the same way or what can each student learn from one another and other's new stories.
Speaking Section: Another great usage for international projects and collaborating. Love the debate idea... debate a common issue that could be interpreted different ways depending on what country you live in.
Great ideas for using wallwisher in the classroom. These can also be used with other web 2.0 tools if you don't like wallwisher. I added a couple of comments.