I bet you always wanted to re-arrange your -internet-map-layers (or pages in a cms) using drag and drop like in arcview. Recently introduced dhtml features allow you to do it. Both Dojo and script.aculo.us offer a script which can re-order <ul><li> items using drag and drop.
look at the demo at http://wiki.script.aculo.us/scriptaculous/show/SortableListsDemo
