With iCloud, you're able to stop worrying about syncing your content and let Apple push it instantly to all of your computers and mobile devices. You can start working on a document in iWork on your computer, pick up your iPad when you're on the sofa and resume right where you left off, without saving, e-mailing or uploading anything.
The same system works with your media content: Purchase a song from iTunes or download an app from the App Store and it's immediately available on your other iOS devices and in your computer's iTunes library.
Another major iCloud feature is called Photo Stream. After testing this feature for the last few months, I'm completely in love with it. If you have more than one computer, it used to be difficult to manage an iOS device because data, including photos, could only be synced with one computer. With Photo Stream, Apple automatically pushes your photos to all of your computers and other iOS devices, and it stores up to 1,000 photos for 30 days. Just grab the photos you want, drag them to an album on any computer on the iPhone 4S itself, and you don't ever have to worry about syncing your images again.
Other notable iOS 5 additions include the ability to sync your device to iTunes over Wi-Fi instead of plugging it in, wireless nightly backups to iCloud, and important enhancements to the Mail app like the ability to flag your e-mails, search all content, and mark all as read.
Another big milestone: IOS 5 finally enables you to use your smartphone or other device completely PC-free. You don't need to plug it into a computer to set it up, or use a computer for anything if you don't want to.
