QuickTime 7.2 addresses two critical security fixes and also adds support for full screen viewing in QuickTime Player (something I have wanted), updates to the H.264 codec, and bug fixes. The security fixes a potential memory corruption due to QuickTime’s prior handling of maliciously crafted movie files.
Apple also released iTunes 7.3.1, which addresses a reported problem with iTunes 7.3 accessing the iTunes Library.
Both are available via Software Update preferences.