Apple just pushed out the update to iTunes users for version 9.2. What do you get with this? Compatibility with iPhone 4 and the iOS 4 operating system for iPhone, iPod Touch, and iPad. This includes the updated iBooks 1.1 application for iPad and now iPhone. Here's Apple's full release notes:

• 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