Any suggestions for remote brainstorming with whiteboard and all that? I would like a large-ish collaborative drawing surface, and ability to see the faces of

Any suggestions for remote brainstorming with whiteboard and all that? I would like a large-ish collaborative drawing surface, and ability to see the faces of my collaborators (2-3 people), as well ability to request and grant control of the board. So much of our design came out of impromptu design sessions, I don't see a future without it.