Demographics are a key piece of information to understanding vulnerability and risk for mitigation purposes.  There are now 12 new demographic thematic map layers available on ArcGIS Online offered at no charge to the ArcGIS Online user community.  In many cases these layers are based on current year demographics.  These map layers can be leveraged both on the web and on the desktop.

You can access the layers here - http://resources.esri.com/arcgisonlineservices/index.cfm?fa=content.  The demographic variables include:

1. USA 1990-2000 Population Change
2. USA Average Household Size
3. USA Daytime Population
4. USA Diversity Index
5. USA Labor Force Participation Rate
6. USA Median Age
7. USA Median Home Value
8. USA Median Household Income
9. USA Population Density
10. USA Projected Population Change
11. USA Recent Population Change
12. USA Unemployment Rate

You can interact with these layers in an application here - http://downloads2.esri.com/mappingcenter2007/maps/worldtopomap/ESRI_demographics_Ex.html.

If you want to add this to your Emergency Management Common Operational Picture Template or Sample Flex Viewer simply add a new mapservice element within the livemaps section of the config.xml such as:

<mapservice label="US Daytime Population" type="dynamic" visible="true" alpha="0.75">http://server.arcgisonline.com/ArcGIS/rest/services/Demographics/USA_Daytime_Population/MapServer</mapservice>