Hi...<p>Love the idea and you've got a strong landing page... I like it, and have wanted to work on something similar for some time.<p>I tried to sign up, but wasn't able to. The sign up form just loaded to the same page, no error messages, no confirmation emails etc. I tried logging in with the details I used but it just came back to the login page, with no error message. Using firefox 18. Hit me up on twitter (@jayoneil) if you want me to try again...<p>I'm pretty keen to see your implementation and see how it works. Have you thought about deciding on a standard format for CC-licensed lessons? That way you could potentially integrate lessons from here into other systems / apps / viewers too.<p>Jason