Definitely one of my favorite academics out there. He delivered the now famous TED Talk "Do Schools Kill Creativity?". Some great information on here, including thought-provoking discussion and plenty of paradigm-challenging discourse.
This is a past k-12 music teacher who voices her opinions on the controversies in eductation as well as the positives. I loved reading her blog. It gave me a new perspective on some things that I really didn't think about before!
Variety of historical information, broken down by topic, can be found in this blog. Most topics discuss controversies, have images/documents and fun facts.
This blog has a little bit of everything! It gives creative teaching tips as well as fun educational resources and activities to do in your classroom. I love the organization ideas as well.
This is a great place to see what concerns the youth of today. This will give teachers ideas on what hot topics are out there (especially for classes that have debates).