$("ul#dest").sortable({items: "li:not(.placeholder)",
                   placeholder: "my_item",
                   start: function(e, u) {
                     // Get ID of dragged item.
                   },
                   update: function (e, u) {
                     // Stick the item in model, synchronize with server
                   },
                   sort: function(e, u) {
                       $( this ).removeClass( "ui-state-default" );
                   }
                  }).disableSelection();

$("ul#src li").draggable({appendTo: "body",
                   helper: "clone",
                   connectToSortable: "ul#dest",
                   start: function (e, u) {
                     // Get ID of dragged item
                   }
                  });