There are a lot of these about and I’ve not tried this one yet but it does look quite interesting.
It hits several buttons for me – Looks simple, no special software needed, nice sharing tools.
It looks like there are two basic sections here, sharing resources and live presentations.
The Sharing resources includes a sort of YouTube for powerpoint so that people can see presentations online.
The virtual classroom bit provides a video and audio feed to an individual or a group and a whiteboard.
I think I’d like to get a good group of interested (mature) pupils on this for an hour and see what they can do with it.
They also have a Moodle plugin