Apple has released an update to QT 7, mainly about some iDVD issue. (And probably "general reliability and performance improvements" as well.) ;) 51 MB for you through Software Update.
A side note: Those who retain their old QT 5 or 6 Pro players to have fullscreen (and other) feature(s) in QT 7 (non-Pro) should not install this update - or be prepared to finally pay up and buy a QT 7 Pro license. The update kills the old players' abilities.