The move page function seems to have a new and exciting bug which can damage the edit history of the page you move by combining it with the edit history of the associated talk page. (This makes diffs very interesting!)
I'd recommend against using it for the time being.
See bug report: http://sourceforge.net/tracker/index.php?func=detail&aid=584649&grou...
-- brion vibber (brion @ pobox.com)