Today both google and facebook turn on their IPv6 addresses in their DNS servers for one day.
C:\>ping www.google.com Pinging www.l.google.com [2001:4860:800c::93] with 32 bytes of data: Reply from 2001:4860:800c::93: time=29ms Reply from 2001:4860:800c::93: time=32ms Reply from 2001:4860:800c::93: time=68ms Reply from 2001:4860:800c::93: time=28ms Ping statistics for 2001:4860:800c::93: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 28ms, Maximum = 68ms, Average = 39ms C:\>ping www.facebook.com Pinging www.facebook.com [2620:0:1c00:0:face:b00c:0:2] with 32 bytes of data: Reply from 2620:0:1c00:0:face:b00c:0:2: time=102ms Reply from 2620:0:1c00:0:face:b00c:0:2: time=125ms Reply from 2620:0:1c00:0:face:b00c:0:2: time=94ms Reply from 2620:0:1c00:0:face:b00c:0:2: time=95ms Ping statistics for 2620:0:1c00:0:face:b00c:0:2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 94ms, Maximum = 125ms, Average = 104ms
My ISP timewarner cable does not support native ipv6 yet, so I am still using he tunnelbroker for my home connection. Nonetheless it works pretty well.
Both most recent Tomato Firmware and Openwrt trunk version have built-in 6in4 and 6to4 support.
Update 1: http://test-ipv6.com/
Update 2: http://ipv6-test.com/