Here is a tool worth checking out. Murally allows you to create an image-rich mindmap and invite other users to contribute. Murally logs each user's contributions, and even allows space for a little chat window. This could have some interesting uses in the classroom, but also has potential for teachers to collaborate with each other.
For those who were at our holiday workshops or those who maintain a website to use with their students or colleagues, here's a handy little freebie. Remember how we made text links in our Posts & Pages? If you do exactly the same thing, but with an image instead, it turns the picture into