Just saw XpAssociate over at shellcity and gave it a quick try. It's not bad... does what it claims! While the overall GUI is not too impressive, the tree pane is pretty cool because of the "quick filter" at the top. Give it a try! mouser, I thought of your recent treks into hierarchical structures when I saw it... pretty nifty idea!
http://www.memecode.com/xpassociate.phpKevin