iEARN: I would use this in my classroom as a way for students to develop an understanding of different cultures as well as respect them. I think that it is also a great way for students to collaborate. Students and the teacher can create and post projects on the site.
Global Schoolhouse: This is another tool that supports and encourages collaboration on the international level. This site is user friendly and informative on what they do. I think that I would use this with my students, and as a class pick a country that we could collaborate with.