Collaborate on Group Projects with Mindmeister
In the old days, they called it collaboration. Today it's "mind-mapping"--the process of laying out ideas on a virtual whiteboard that others can see and share (even if they're in a different location). Mindmeister provides just such a shared workspace, one that's ideal for brainstorming, project planning, and the like. These mind-maps can be printed, exported, and even discussed via Skype (which can be launched from within the Mindmeister interface).
You can use Mindmeister free of charge for up to six mind maps. The Premium version, which offers unlimited maps, ad-free operation, and the option to embed maps in sites and blogs, costs about $4 per month. Whether you want to organize your own thoughts or organize an entire team's, a tool like Mindmeister could come in really handy.