Apple has released a minor update to iTunes 9.2 to fix some bugs and keep iTunes running.
The most interesting change made to iTunes 9.2.1 is that it will disable "older versions of some incompatible third-party plug-ins." Apple hasn't provided any details as to which plug-ins are incompatible with iTunes 9.2.1, however.
Also among the list of issues resolved are fixes to address minor issues with dragging and dropping items within iTunes; a performance issue after syncing to some devices for the first time with iTunes 9.2; an issue with upgrading to iOS 4 on iPhones and iPod touches with encrypted backups; and the requisite improvements for "stability and performance."
iTunes 9.2.1 requires Mac OS X 10.4.11 or later to run, just like iTunes 9.2. You can update via Mac OS X's Software Update feature, or from Apple's support Website.