I've been looking at this as well and reported on the relative amount
of IPv6 traffic over the past 4 years at the most recent NANOG (http://www.potaroo.net/presentations/2008-10-13-ipv6-deployment.pdf
)
in recent times I am also seeing 0.5% of hosts preferring to use IPv6
to access a dual-stacked site - the good news it that this number has
risen sharply in the past 18 months. The not-so-good news it thats its
still a bloody small number!
The AS count might also be of interest - 15% of the non-stub IPv4
addresses (AS's that offer transit to other ASes) also originate IPv6
prefixes.
Geoff
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