This blog discusses the US dst 2007 issue.
http://www.edgeblog.net/2007/daylight-saving-time-the-year-2007-problem/
Unfortunately, this change has not received the attention it deserves,
so many IT shops have not yet started, and there are only 60 days to
get patches tested and deployed.
That blog points to:
http://archives.postgresql.org/pgsql-announce/2007-01/msg00004.php
as a response to the problem. I don't see any mention of the topic in
the accouncement or in the release notes. Josh does mention Canada
and Austrailia fixes. Is this topic covered somewhere in the pg docs?