My good friend David Wiley was among the first people that I know of who decided to experiment with open teaching. This semester he’s at it again with a massive open online course or MOOC on open education.
You can find more information about it here, including how to sign up, participate, and even earn badges (which can lead to college credit):
Best of luck to David this semester on this endeavour. Please note that I will soon be announcing my own mini-MOOC for the Summer 2012 that will focus on some aspect of K-12 online learning. This will be a pre-cursor to running a full MOOC during the Summer 2013. Stay tuned for more details!