If there's such a compelling need for native multicast, why has it seen such limited deployment

It hasn't been needed by enough people We have a growing need and are doing a little bit to encourage use http://www.bbc.co.uk/multicast/ Other content owners agree, we have a number working on joining us (sadly I can't mention names until they're live) This is a work in progress (it's been live for two weeks), we have a long way to go. When I see a need for V6 and it looks viable I'll try and do the same for it. As it's only doing something we can do already it'll be a harder sell. brandon