iOS 5 includes many new features, one of the major ones is the new iCloud support. iCloud allows you move your data into Apple's data centers, and access it from any of your iDevices (e.g. iPhone, iPod Touch, iPad, etc.).
Some of the new features of iCloud includes the following functionality:
- 5GB of free storage.
- iTunes in the cloud, with the optional iTunes Match feature.
- Photo Stream allows you to automatically syncs your pictures between your iDevices.
- Store all your data (e.g. music, photos, documents, bookmarks, reminders, notes, and books) in the cloud.
- Sync your contacts, calendar, and email between your iDevices
- Find My iPhone