I notice RedHatters are experiencing this as well with glibc 2.9.x, although it 
may be stirred in with other issues:
https://bugzilla.redhat.com/show_bug.cgi?id=459756

Everyone seems to be poking at it rather blindly right now; my own
(uneducated) guess is that even in relatively sane configurations, there
can be a race based on the order in which A and AAAA answers are
returned, absent more mechanisms to ensure good A answers aren't
discarded or ignored in favor of AAAA on systems that really only have
IPv4 routes anyway.

[If this is the case... then the idea in the RedHat bug is probably not
bad; being able to specify policy in nsswitch.conf along the lines of
"hosts: files dnsv4 [notfound=continue] dnsv6" would 'prefer' A
responses without masking the existence of v6-only systems that only
have AAAA records, not A.]


I'm surprised this isn't getting more attention - am I alone, or is it that 
anyone else affected is having trouble reaching bugs.launchpad.net to comment? 
:}

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[Jaunty] Multiple DNS resolver issues on ia32 and AMD64
https://bugs.launchpad.net/bugs/326718
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