''Overlay Multicast Networks '' -- ThinkingOutLoud DonaldNoyes 20070208

 ''By shifting the multicast service from a primitive network layer mechanism ''
 ''to a service level infrastructure, overlay networks allow service providers'' 
 ''to assume full control of its own service networks and make it easier for'' 
 ''users to create sessions and obtain better quality of services''
** http://www.arl.wustl.edu/~sherlia/amcast.html
** http://www.google.com/search?sourceid=navclient&aq=t&ie=UTF-8&rls=GFRC,GFRC:2006-50,GFRC:en&q=Overlay+Multicast+Networks
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Issues
 DynamicRouting
 CommunicationCost