The TouchGraph interface has more potential than the existing fixed one. Mind maps are not supposed to necessarily be hierarchical, but organically growing and intertwined a lot. In FreeMind I can add links, but they aren't really good if compared with something universal like TouchGraph (GoogleBrowser, WikiBrowser).
I think FreeMind would become much more powerful (not to mention cool looking) if it had a dynamic mode without a root node. It would be great if arbitrary links (not just parent/child) between any nodes were supported, if text size and colors would dynamically adjust according to the distance, relevance and other factors, and if the layout would be dynamic, with the graph rearranging itself on the fly.
More details at the TouchGraph site (http://www.touchgraph.com/), and at this page: http://www.jspwiki.org/PageInfo.jsp?page=TouchGraphWikiBrowser\).
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