There's a directory, where QuickTime player stores the remote movies which have been played. In the application cleaner settings, there's a Multimedia>QuickTime section, which I always had checked, but this option obviously doesn't include the directory I'm about to mention (or QT itself has changed the location in time). The path on my computer is:
c:\Users\{username}\AppData\LocalLow\Apple Computer\QuickTime\downloads\
The operating system is Vista 32b, QT is 7.6.5
I've stumbled upon this a while ago, and always forgot to post this for you So now I'm doing it. Once, I've gained GIGS of space when I've deleted those temp files, so I thought it might be worthy to include in CCleaner.