IPv6 was supposed to replace IPv4 7 years
ago. I don't think it is going to replace IPv4 any time soon, sadly. If you look at my location, you'll see it is a IPv6 address.
That was how I felt until my company received a letter from ARIN last month. (ARIN = American Registry for Internet Numbers, i.e. the numbering authority for North and South America)
The letter was informing my company (a local phone company) that as of May 16, 2009, they were going to begin enforcing a much more strict policy of IPv4 allocation justification standards, due to the fact that IPv4 is projected to be completely allocated mid-year of 2011. They suggested strongly for us to begin supporting IPv6.
I have begun doing just that, and as such, am looking into PHPbb's support for IPv6, as I am going to be using it to run our alpha / beta testers forums, and it would seem dumb to run our IPv6 portal on something that doesn't support the technology.
I just wanted to throw that in the ring for discussion, as those who hold the view "we'll never go v6 because it's been aroudn for a decade so far, and nobody's using it" are in for a rude awakening as I was myself.