Clearly, YouTube has the most to gain by some of the advantages of IPv6's router optimization and resource allocation support, but it is likely that many will soon follow their lead.
For the rest of us, we can sit back and enjoy our new IPv6 streaming videos from YouTube such as the one below:





The spark for innovation comes in many different ways and in many different delivery mechanisms. I did a major upgrade to my home automation system last night with the guys over at 
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