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EduSim is a very cool whiteboard tool that incorporates a virtual, 3D learning environment for teachers and students, k-12. Built on the open source virtual world software Croquet, EduSim offers a pretty inclusive way in which communication can take place through the merging of white boards.
EduSim whiteboards support images, music, videos and documents. They are all 3D, so a video that's been pulled into EduSim can be stretched, rotated, and spun. The same goes for photos. Documents that are pulled into EduSim can be read and edited by participating members of a merged whiteboard session, which is great for learning environments. There are also drawing tools, so you can create some free-form images, mark up images, and more.
A pretty cool feature that was displayed in the intro video (see below) shows 3D objects that can be incorporated into your whiteboard session, with images that can be applied to these 3D shapes. So you can take a 3D sphere and apply an image of the moon's surface in order to get a 3D moon.
The EduSim whiteboard tools are fairly new. That being said, the team behind EduSim has offered some suggested ways in which teachers can use this for various lessons. Beyond that, teachers can take their own approach to creating lesson plans and implement them within EduSim however they see fit. I think this is a good platform for interactive virtual learning, and as we've seen with things like Second Life, virtual worlds can be used for a wide variety of activities. With EduSim's inclusive whiteboard interaction, however, it can be used for a variety of activities as well, including team meetings for small businesses.