Text 2 Mind Map is a site I learned about from a trusted online resource, Skip Zalenraitis. After taking a look and testing it, I'm super glad that he found this, because it is a great great site.
T2MM is a site where users can type in their text and convert it to a mind map. It kind of resembles Inspirations built in diagram feature from a outline. Actually, that's exactly how I made the mind map below. I just typed in outline format and clicked generate, it's that easy.
One thing to keep in mind this site is still very new and being worked on, but it does seem to be an invaluable tool teaching students how to brainstorm and use mind maps.
Click here for more info.