Apparently Microsoft.WindowsAzure.CloudConfigurationManager.GetSettings will start by looking in ServiceConfiguration.*.cscfg and then fall back to web.config and app.config.
But - what format should this be in web/app .config?
E.g. to get Microsoft.WindowsAzure.CloudConfigurationManager.GetSettings("Foo")
to pick up from app.config what would the XML look like?