Nice work. It might be easier to make the entire canvas draggable like google maps instead of the separate zoom control. While it's nice and easy to be able to

Nice work. It might be easier to make the entire canvas draggable like google maps instead of the separate zoom control. While it's nice and easy to be able to start using without making an account, it's a pain to find a whiteboard I created once I left the site. I know it's in my inbox, but you might want to provide a login or a memorable URL once people have got started with their email address.