My partner in crime Nic & I produced a screencast last night demoing Edmodo in action. There is a button in the bottom right of the video player to watch in full screen, I recommend it.
I just posted our first screen capture of a 90% working demo of Edmodo over at the Edmodo Blog. Please wander by and leave a comment and tell us what you think. If your interested in hearing more about what we are up too with edmodo, subscribe to the Edmodo RSS feed also or sign up for our e-mail list when we launch our private alpha.