Thanks for the earlier reply about coding in an option to open gallery items as ArcGIS Explorer Online presentations.
Now I'd like to request an option to show link(s) at the bottom of the basic map viewer to point to the ArcGIS.com viewer and possibly others. Like with the Gallery and basic viewer we hosted on our San Mateo County (Calif) web server here .
The capability at ArcGIS.com > map > share > embed includes a similar link to "View in Larger Map". This sends the map ID to the ArcGIS.com viewer.