Spotfire Ideas Portal
Double list box will allow users to easily select from a huge list of option items from the left box to the right box for non tech savvy users. Similar to multi select list box while users need to multi select (ctrl) items and it's not easy to display all selected items.
Check box (not implemented) made easier for users to multi select but still no display for selected items.
Search field on the top is also helpful when a large number of items are listed, similar to search filed in List Box Filter.
Currently, heavy javascript work needs to be done in order to get this feature.