Does anyone else think it is a bug that the permissions are wide open on files copied from disk images?
The most serious consequence of this bug is that the average Applications folder is full of apps with wide open permissions (ie, they are world writable), due to the apps being simply dragged over from disk images.
Apple apparently considers this correct behaviour, but I can't see how they can think this is the case. It basically defeats the purpose of having separate administrators on machines except where the administrator is knowledgeable enough to alter the permissions on every disk image installed application.