School of Everything has just launched. It's a social learning network that connects people who can teach with people who want to learn. Whatever you want to learn, and whatever you teach, they'll connect you to people near you (or online) who can teach or learn with you. And it's completely free.
Find new things to learn, and new people to learn with. Keep track of what you want to learn and share it with your friends. Got something to teach? Create a teacher page and offer your skills to the community and the world at large, for hard cash or just for the love of it.