I ran across a helpful mind-mapping tool yesterday while working on our action map assignment for IT 570. Cacoo.com is a collaborative tool that allows individuals and groups to create charts that suit their needs. You can use it via the web and share it with whomever you choose. There is also a Cacoo app within Google Hangouts that would allow teams to collaboratively edit a chart or mind map in real time. Pretty Cool.
Here is a quick video from Cacoo.com.