After giving it a look, I must say that I am very intrigued. I would love to see this used in a "real" teaching environment. This could be great for the higher grade levels. There are some nice teacher features too, such as the ability to embed.
I'd love to see a paid service that filters content for this site, that would be ideal for education.
I highly recommend checking out HootCourse by clicking here.
A big thank you to Free Technology 4 Teachers for his excellent review!!