Webspriation is a great visual thinking tool. If you are familiar with Inspiration, you'll know where the name originates. There are many names for this: concept mapping, mind maps, idea webs. Whatever you want to call it, visual thinking clarifies thinking and is another way of organizing ideas.
Perhaps the best thing about this (besides the fact that it is currently free) is that it is housed online so allows the user to set up collaboration groups.
What a great tool for collaboration with groups in different schools! Here is a sample of a collaboration amongst our 10 buildings to create the 'backbone' of our 'shared folders' section.
It will be too small to see here, but click on it and it will enlarge.