QuickTime Player 7.6.6 for Mac OS X 10.6.3
Apple has released QuickTime Player 7.6.6 for Mac OS X 10.6.3 Snow Leopard with absolutely no release notes, so there’s no telling what has changed. Remember that Snow Leopard now comes with a new QuickTime Player for QuickTime X, so the only reason you would want QuickTime Player 7 is because it supports older media formats, such as QTVR, interactive QuickTime movies, and MIDI files on Snow Leopard. It also accepts QuickTime 7 Pro registration codes, which turn on QuickTime Pro functions. Apple explains more at this Knowledge Base article. (Free, 10.65 MB)
Player 7 also allows screen captures, which X does not. I use 7 every time I post a video, to grab a frame for the poster link.
Quicktime Player 7 also allows f.i. rotating a movie. In version 10 I have not found this functionality yet.
I dont think this is new... I have that version (7,6,6) since more than one year.
Yes, it's very odd. 7.6.6 just appeared on Apple's Support Downloads page, and different people have different versions for no apparent reason (I have 7.6.3, for instance).