I note that the current download page for 64-bit iTunes includes the following:
Note: iTunes 10.5 no longer requires or includes QuickTime.
Something to bear in mind when recommending people to update their QuickTime (i.e. updating iTunes will no longer provide the QT update). They will need to go to: Apple - QuickTime - Download
Insanity is hereditary, you get it from your children
Thanks for the tip, Neale!