One of the best ways to plan a composition or to prepare for tests is by using Mindmaps to collect and add to our knowledge of a subject.
Mindmaps, with their brain-friendly combination of images, colours, and information mimic the way the brain works. Data in a mind map is connected in a messy network of interlinked branches rather than the bullet point approach normally used in note-taking.
These are some great free tools online that make mindmapping easy;
Mind42.com is a free online web app that allows you to collaborate with multiple users in real time.
Spinscape.com is a new mindmapping tool that is simple and easy to use. It allows you to add content from the web to your mindmap.
Slatebox.com allows you to easily turn your mind map into a presentation that zooms from concept to concept.