If you have your students working on any projects that start with a brainstorming or mind mapping session, consider using SpiderScribe.net. It's an online tool that let's you organize your ideas by connecting notes, files, calendar events, locations, and images in a free-form map. Even better, you can share your map to collaborate with others. I really like the simplicity of this tool and the fact that you're not bound by any templates. To learn more about SpiderScribe.net check out their 2 minute video intro.