As we expected, Apple today released iOS 4.2.1 and brought all supported devices up to the same version of the operating system. You can upgrade by plugging in your device and checking for updates in iTunes.
The update is free for all devices that can run iOS 4, which at this point is every iOS portable device other than the first generation iPhone and iPod Touch.
For iPad owners, iOS 4.2.1 is a very significant upgrade; many of the features that other iDevice owners have been enjoying since iOS 4 was released this past summer are now available on Apple’s tablet. Game Center, folders, tv show rentals, the unified email inbox, and of course multitasking are all now available on the iPad. Read more