Constraint objects: View or select the object it's constraint to in the channel box.
Right now you have to go to the Node Editor to find out what an item is Constraint to. Even then, sometimes it's hard on the eyes to find what's it's connected to. In addition to the Node Editor, I would have the name of what the item is constraint to in the channel box. There's already attributes there under Shapes but it doesn't tell you what it's constraint to.