One idea that came to me was to find a site where children all over the world submit artifacts around a common topic. For example at the 5-6 year old (K-1) exchange, we would have a list of questions about common practices/activities in the classroom -each question on a different web page/resource (wiki, SchoolTube channel, ?). Then children could use the website for data comparison and analysis. I haven't researched the best resource just brainstorming!
Use this area to add brainstorming ideas on how we can best collaborate as we write our curricula together on-line... Google docs (free) Zoho (minimal charge), Moodle, etc. ?