As per title.
This is what it fixes:
iTunes 9.2.1 provides a number of important bug fixes, including:
• Disables older versions of some incompatible third-party plug-ins
• Addresses minor issues with dragging and dropping items
• Addresses a performance issue when first syncing to some devices with iTunes 9.2
• Addresses an issue upgrading to iOS 4 on an iPhone or iPod touch with encrypted back-ups
• Addresses other issues that improve stability and performance
iTunes 9.2 comes with several new features and improvements, including:
• Sync with iPhone 4 to enjoy your favorite music, movies, TV shows, books and more on-the-go
• Sync and read books with iPhone or iPod touch with iOS 4 and iBooks 1.1
• Organize and sync PDF documents as books. Read PDFs with iBooks 1.1 on iPad and any iPhone or iPod touch with iOS 4
• Organize your apps on your iOS 4 home screens into folders using iTunes
• Faster back-ups while syncing an iPhone or iPod touch with iOS 4
• Album artwork improvements make artwork appear more quickly when exploring your library