One use of UR could be a general "mind mapping", cause the familiar tree structure of Data Explorer is nothing else than what we see on all those "Mind Mapping softwares", where nodes are items. The only thing that is needed, is different view of Data explorer tree. Once user hoists the item (that becomes the root item) and change Tree view, UR could be used as a Mind Mapping software. Examples of how "Tree View" could look like (static, no need for dynamic reorganization)...
Root on the left side:
http://www.mindgenius.com/website/im...amilyhowto.gif
Root in the middle:
http://knoppix.tnc.edu.tw/knoppix_do...e/freemind.jpg
Any ideas?