The VisualLiteracy.org focuses on visual ways to create and communicate knowledge and insights. They use a didactic approach to teaching people how to develop their own visualization formats. They offer an e-learning course for building skills in visualization in order to build competence in communication.
They have developed an Ajax based Periodic Table of Visualization Methods. There are 6 different cell colors:
> yellow = data visualization
> light green = information visualization
> aqua = concept visualization
> light blue = strategy visualization
> pink = metaphor visualization
> light purple = compound visualization
Just mouse-over any of the cells and discover another way of charting, mapping or visualizing knowledge.