直接從 iTunes 的檢查更新即可找到，
有興趣的人可以下載，
應該可以搭配 iOS4 GM 來更新你的 iPhone 3G/3GS 吧？
如果願意在 iOS4 正式版發布前先嘗試的話。
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
For information on the security content of this update, please visit: http://support.apple.com/kb/HT1222
