Apple on Wednesday released iTunes 9.2. It’s now available for download through the Software Update system preference.

The bulk of what’s changed with iTunes 9.2 has to do with supporting new features found in iOS 4, the new version of the iPhone, iPod touch and iPad operating system.

iOS 4 makes its debut on June 21, 2010, three days ahead of the release of the iPhone 4.

According to Apple, new features in iTunes 9.2 include:

• 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