[Joeboy]

Is this not the sort of thing IP multicast is for?

[wmf]

IP multicast is turned off on the Internet.

[timthorn]

Depends on which bit of the Internet - the BBC transmits (or at leat used to) live streams via Multicast to a number of UK ISPs.

[bvdbijl]

Thank god... imagine the incredible noise

[sargun]

What do you mean? The whole point of multicast is that you don't have noise. You choose exactly what you want to get.