We have posted a new tech note which describes how to pass login credentials from Flash to ColdFusion via Flash Remoting. Here is the description from the technote:
This TechNote describes how to use Flash Remoting with ColdFusion’s built-in authentication mechanism and ColdFusion components. It shows how to use the ActionScript setCredentials method on the Flash side to pass credential information to the cflogin tag on the ColdFusion side.
You can read the entire technote here.