This is 8 Jun 2011, for 24 hours, starting 00:00 GMT. If you are having problems accessing major sites, you may like to call your ISP for assistance, or disable IPv6. A hotfix is available from Microsoft for Windows which will temporarily disable IPv6 until 10 June. To find out if your PCs or network might have problems in advance, use a PC with images and scripting enabled to visit http://www.omgipv6day.com/ .
Cheers, Sabahattin PS: The WWDC 2011 Keynote didn't mention improved IPv6 support in OS X Lion and recent updates of Snow Leopard, but it's there.
