A superb, 'must try' collaborative whiteboard site. Invite collaborators to draw, write, screen capture and upload documents onto your whiteboard in real time. Great for webinars, distance learning, howework or group work in class.
"embedit.in is the easiest way to embed any document or any webpage in your blog, profile, or website. It works with PDF, Word, Excel, PowerPoint, and many other formats. It's totally free of charge. "