Here in NZ our local distributors (Eagle Technology) along with some Consulting Companies (Isovist, GBS, etc) have developed a tool for Portal for ArcGIS to Switch Maps (Web Apps). This is part of the local maps initiative between Local Councils and Vendors to create a single sent of widgets for a similar look and feel.
When the users selects the tool they are presented with a list of available maps to switch between
What would be really awesome is to have this same functionality in ArcGIS Online. This would then allow our organisation to use ArcGIS Online as our sole web mapping application for both internal and external mapping.