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I used Siri primarily for creating reminders, but am already finding this iOS 6 version more useful as I create reminders and calendar appointments, check on my sports scores, create notes, and more.
Facebook integration: Similar to how iOS 5 added Twitter share integration, iOS 6 adds Facebook integration so you can share to your social network.
Do Not Disturb: It was a pain to have to manually manage all of your application notifications individually and thankfully iOS 6 adds a single Do Not Disturb slider. You can also configure when this Do Not Disturb feature is active, such as at night when you are sleeping.