I have just spent the last few days investigating tunneling ipv6 from my vps to my wheezy box at home and so giving my home mini-network ipv6 access. On the way I have learnt a lot about routing etc. It is now working nicely, but what has amazed me is how small the ipv6 take up seems to be.
Once I had established that I could ping6 fairly local addresses, I tried pinging further afield and when some of those failed, I tried dig aaaa on them and found that there were no aaaa records. We are talking big names here -
amazon.co.uk etc. Interestingly, my isp doesn't provide ipv6 connectivity to customers, but I can ping6 them!