LiveBinders - looks like a good addition to Diigo Free. For over 13 years of age - perhaps a great tool for students and for creating a common place for integrated learning projects
Free Online Timeline Maker - Play with it and see if it works for you. I'm interested in using Timelines with Fiction and Non-fiction books, i.e., another way for a student to organize sequenced information.
Thanks for this site. I'm going to send it to some colleagues. We going to try an create a Ning on diversity and multiculturalism. They gave a presentation on the topic at a conference and they want to stay in touch with the participants. This should be a good resource.