Index: ui.droppable.js
===================================================================
--- ui.droppable.js	(revision 393)
+++ ui.droppable.js	(working copy)
@@ -64,6 +64,10 @@
 		if (this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
 			$.ui.plugin.call(this, 'over', [e, this.ui(draggable)]);
 			this.element.triggerHandler("dropover", [e, this.ui(draggable)], this.options.over);
+			
+			// For an exclusive draggable, note which drop zone it is currently over.
+			if (draggable.options.exclusive)
+				draggable.options.isover = this;
 		}
 		
 	},
@@ -75,6 +79,9 @@
 		if (this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
 			$.ui.plugin.call(this, 'out', [e, this.ui(draggable)]);
 			this.element.triggerHandler("dropout", [e, this.ui(draggable)], this.options.out);
+			
+			// Add exclusive code.
+			draggable.options.isover = null;
 		}
 		
 	},
@@ -188,12 +195,16 @@
 		
 	},
 	drop: function(draggable, e) {
-		
+
+		// Check if the draggable is set for exclusive and if it has already been flagged as over the first element.
+		var exclusive = draggable.options.exclusive;
+		var isover = draggable.options.isover;
+
 		var dropped = false;
 		$.each($.ui.ddmanager.droppables, function() {
 			
 			if(!this.options) return;
-			if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance))
+			if (!this.options.disabled && this.visible && (!exclusive || !isover || isover==this) && $.ui.intersect(draggable, this, this.options.tolerance))
 				dropped = this.drop.call(this, e);
 			
 			if (!this.options.disabled && this.visible && this.options.accept.call(this.element,(draggable.currentItem || draggable.element))) {
@@ -213,8 +224,12 @@
 		//Run through all droppables and check their positions based on specific tolerance options
 		$.each($.ui.ddmanager.droppables, function() {
 			
+			// Check if the draggable is set for exclusive and if it has already been flagged as over the first element.
+			var exclusive = draggable.options.exclusive;
+			var isover = draggable.options.isover;
+			
 			if(this.options.disabled || this.greedyChild || !this.visible) return;
-			var intersects = $.ui.intersect(draggable, this, this.options.tolerance);
+			var intersects = (!exclusive || !isover || isover==this) && $.ui.intersect(draggable, this, this.options.tolerance);
 			
 			var c = !intersects && this.isover == 1 ? 'isout' : (intersects && this.isover == 0 ? 'isover' : null);
 			if(!c) return;