This site looks like a great resource for educators. You can learn from someone or teach something to others. You can also find and post learning resources. Collaboration can take place between educators. There are too many things to mention. Check out the FREE and advertisement free website.
Dipity is a site that makes it simple for your students to create and share interactive timelines about any subject or topic. It allows students to embed YouTube videos, RSS feeds, Blogger, flickr, Picasa, music, and more right into their timelines. Very cool application to make teaching history a bit more interesting and interactive!