RealtimeBoard
This is an amazing collaborative whiteboard where multiple users
can edit a multimedia board in real time. The site allows you to
signup and sign in using a Google account and you can access
and add your files and media on your Google Docs/Drive area
making this a fabulous companion to schools using Google Apps
for education. You can write by typing or you can write in 'freehand'
so you can use your interactive whiteboard to write and archive
the lesson to use or refer to later.