Please see http://liquidthreads.labs.wikimedia.org/w/index.php?title=Special:RecentChanges&from=201011100000&days=30&limit=500#23_October_2010 and scroll down to the October 23 section.
I was testing the difference between [[Special:MoveThread]] and [[Special:MovePage/Thread:$1]] when I realized that pages in the Thread Talk: namespace could not be accessed via history, viewing, editing, reading or otherwise. When I moved a page into the namespace, the only way that it could be accessed was by moving it out, or viewing the transclusion for the thread on the appropriate talkpage.
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=25456