ETAN provides a forum for educators and others to engage in the political process and project a unified voice in support of a common cause - improving teaching and learning through the systemic use of technology.
I'm on Twine, and it's been helpful for discovering eLearning web resources. I'm not sure I'd say it qualifies for full-blown "semantic web" or Web 3.0, but it is a great community.
Use drop.io to privately share your files and collaborate in real time by web, email, phone, mobile, and more. Create each drop in two clicks and share what you want, how you want, with whom you want.