Last night I took someone up on a dare and whipped up a quick-n'dirty winforms control which allows graphically mapping connections between nodes in different hierarchial views (represented by treeviews).   The connections are created by dragging nodes from one side to the other, they are selectable (just click on a line), they support context menus.  It is similar to the BizTalk Mapper UI and other graphical XSL generation tools .

Not bad for just under 4 hours of work.  :)  

The source is here. Do whatever you want with it, but be nice and leave me a comment if you use it somewhere.

Note: Altough this written in 4 hours, it was tested for 4 minutes so it doesn't come with any sort of warranty - use at your own risk.