Have you already used Curriki portal?
As one of the GELC leaders I can say that one of the things I like most is to teach. Doing that I have the opportunity to share what I know and always learn something I don't from my students.
Every day I try to make my students open to share what they know with others. We talk so much about open source software, but we have also open source documentation available! We can use Creative Commons license, we can use GNU Free Documentation License, we have lots of options to work with.
Wikipedia is doing a lot for us, showing that we can have knowledge sharing from everywhere in the world, working as a global community.
Now, we have one new portal to share our knowledge! Try curriki.org, and check the Global Education and Learning Community! This website is linked directly into GELC community inside java.net. We have Java projects inside java.net and knowledge sharing inside curriki.org.
I started to use curriki.org a couple of months ago. Check some of the material I have submitted inside the portal using this link.