You should be fine. The reason you can't access those sites, is that you need to have a v6 address before you can view a v6 website. The big players are running a dual-stack network, which basically means that they run both v4 and v6 websites at the same time. Your browser is then directed to the correct version of the site.
I think that the idea behind IPv6 day, is that many sites are switching their v6 service on for the first time, or running a full v6 service for the first time. It doesn't mean that the v4 site will disappear completely.
Could you please let us know if the information provided by fellfromatree helped with your query?
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It's likely that ALL sites out there today will still be reachable in 10+ years using IPv4..
Virgin Media will have more than enough ipv4 Addys to give out to customers until they go bankrupt and nationalized...
The issue (as is, and as will be, that VM will not talk about) is new startups that are ipv6 Only.. Lets not forget that startups such as Myspace, Youtube, and LOTS of broadcasting sites are fairly new.
The ISP doesnt care right now because customers aren't impacted. Sadly (with VM) this means that they will probably migrate when half the userbase is ticked off because they cant reach some new fangled site that's in Alexa's top 10..
Then they'll start doing catch-up and tell us how hard they are working for us ;P...
The equipment VM has listed before shows that their headend should be ipv6 compliant, most of the modems and routers they provide are compliant (with patches), so if VM says they are not ready, then it means that their core fibre network must not be ready :/...
Spooky thought that.
---- I do not work for VM, but I would. It is just a Job.
I would also make websites for them, because the job never seems to require the website to work.
Regular ipv6 (GRE) tunnels like tunnelbroker.net won't work properly behind NAT...
Might need to either route the tunnel to your router (assuming it supports it), or look into using a teredo tunnel (windows 7 usually tries to enable a teredo tunnel by default, but it doesnt always work).