CircleID

Actually there is a killer application and you mentioned it already a couple of times in your application: VoIP.

Or did you get that nice VoIP hardware box working behind a NAT!? ;)

Yes, with tricks like having a local proxy (eg an Asterisk which talks to the outside world using a public address or using TCP) and using tricks like STUN this can partially be made possible, but it is a hassle and requires a box that you should not be needing when you have true end-to-end connectivity (or you are able to get enough addresses ;)

That is the problem that IPv6 solves: more address space.

And effectively it is also the sole problem it solves, as all the others can be and mostly have been backported to IPv4 already.

As the largest usage of "The Internet" is actually that part called by a lot of people "T3h Intarw3b", they solely rely on HTTP and servers which have a public IP address. They themselves can't really care about the fact that they can't be reached as they are behind a NAT, and most even see it as 'security'.

The moment you want to make real use of your IP address though you either need to get a nice public IPv4 address or easier, get an IPv6 one.

I except this year to have a high rise in IPv6 deployment and usage.

Of course http://www.ipv6experiment.com/ is also going live soon (and I heared a whisper that it is not only going to host the naughty content but also getting content that is actually usable by everyone. ;)

VoIP on IPv6 allows you to talk to other VoIP on IPv6 users, which leaves it far from "killer app" status at this point in time.