If you search for only "Live Data Maps" then you should see 4 layers we are hosting for demonstration purposes. Clicking on one will zoom to the extent of the layer, and then a floating content menu for that extent triangle includes the option to add that layer to the map, so you can see the data on the map. Sometimes it takes a little bit after adding the layer to map for the data to show up, and even then, the only layer that is really obvious when it is added is the Fish Species Richness... as it is polygon, and the other layers are little points.
The widget as we have implemented it is still lacking in a few areas: you cannot search for data to add from ArcGIS.com for some reason, and there is no legend system.
