Outline to Omnigraffle Link
This trick with Omnioutliner is great. Convert an Omnioutliner document into a mind map by importing it into Omnigraffle. There are other ways to do this, such as converting it to OPML and importing it into one of the many top notch mind mapping apps. But Omnigraffle has super powers that most mind map apps lack, like better image editing and arbitrary canvas text.