Your favorite online learning resources?

I’m preparing to teach “Strategies and Realities of Teaching Online” this summer. While I have taught it before, it was two years ago that I did that and I’m seeing a huge need for changing this course. So guess what? Less than a week before it begins, I’m rewriting the course. So here is where YOU come in… what are your favorite online learning resources? What video hit you upside the head that the educational world as you know it has changed? What tool do you use now that you just can’t live without?

I’m anxious to hear your thoughts. Just put it in the comment section below. :) I’ll be sharing your answers with my students who are in the K12 system and in higher ed.