Apple has updated QuickTime and iTunes, resolving issues with the H.264 video codec and fixing bugs. The primary changes in QuickTime 7.2 are fixes for several potential security vulnerabilities [1] related to playback of malformed movie files and visiting maliciously crafted Web sites. However, more interesting is one other long-overdue change: movies can now be viewed full screen in QuickTime Player, a feature previously available only after purchasing a QuickTime Pro license. This update also adds two export formats: Movie to iPhone creates an .m4v video, while Movie to iPhone (Cellular) creates a smaller .3gp video. QuickTime 7.2 also rolls in unspecified updates to the H.264 codec and other bug fixes. It's available via Software Update or as stand-alone downloads for Mac (a 51.4 MB download [2]) and Windows (a 19.3 MB download [3]).
iTunes 7.3.1, according to Apple, "addresses a minor problem with iTunes 7.3 accessing the iTunes Library." As such, the new version rebuilds your library, so it's a good idea to make sure you have a recent backup before you update. iTunes 7.3.1 is available for Mac (a 33.8 MB download [4]) and Windows (a 47.6 MB download [5]).
There has been discussion in TidBITS Talk [6] of these updates causing problems with Microsoft Office 2004 and some other applications that rely on Mac OS X's Rosetta translation environment for PowerPC-based applications running on Intel-based Macs. From what we can tell based on a discussion at Apple's site [7] and from MacFixIt reports [8], the problem relates to update_prebinding failing to run properly during the update process. Once update_prebinding has been run successfully by typing "sudo update_prebinding" in Terminal or by reapplying the Mac OS X 10.4.10 combo updater [9], all should be well unless Java SE 6.0 Release 1 Developer Preview 6 has also been installed; it must be uninstalled according to the directions at MacFixIt before running update_prebinding.
[1]: http://docs.info.apple.com/article.html?artnum=305947
[2]: http://www.apple.com/support/downloads/quicktime72formac.html
[3]: http://www.apple.com/support/downloads/quicktime72forwindows.html
[4]: http://www.apple.com/support/downloads/itunes731formac.html
[5]: http://www.apple.com/support/downloads/itunes731forwindows.html
[6]: http://emperor.tidbits.com/TidBITS/Talk/1377/
[7]: http://discussions.apple.com/thread.jspa?threadID=1039074&start=0&tstart=0
[8]: http://www.macfixit.com/article.php?story=20070713094450677
[9]: http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx10410comboupdatev11intel.html