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I've used many mind mapping tools and find them lacking in functionality (xmind) , expensive (inspiration) or very hard to use (Free Mind). Most of these tools will not allow you to have 2 main topics and create a double bubble map (like a venn diagram). Edraw Mind Map has a very easy to use ribbon interface similar to Word 2010 and tons of built in symbols and mind mapping templates. It is free for educational use and their site has tons of video tutorials that cover all the nifty features. It's the first mind mapping program where I felt like I wasn't fighting the interface.