Browsing over IPv6

[George Mitchell]

With both firefox and chrome, if I browse to
http://sports.yahoo.com/mlb/teams/bos
the computer hangs forever "Waiting for l.yimg.com".  If I browse to
http://dvd.netflix.com/, the computer hangs forever "Waiting for
cdn-0.nflxing.com".

I've been using IPv6 for quite a few years without problems and I've
had no difficulty browsing www.ipv6.org and other IPv6 sites over IPv6,
and my system serves www.worldcon.org over IPv6 as well.  Further, I can
ping6 and traceroute6 to both l.yimg.com and cdn-0.nflxing.com, and I
can even telnet to port 80 of those two sites (but I get errors trying
to "GET / HTTP/1.1").  So what's the most likely point of failure?
-- George