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Do Not Disturb could be a lot better
Do Not Disturb is a great feature, but Apple could do a lot more with it. Perhaps location-based features would be a boost to the feature set? That is if Apple can sort location-based services out.
Notifications need to be managed better: A 'clear all' button?
The notification center allows you to look at a glance what is going on in your world. Birthdays, emails, text messages, calendar events, and social networking. But going through each section and clearing it bit by bit could be made easier with a simple "clear all" button. Once you've seen it, you've seen it.
Passbook is essentially useless without industry support
Designed to get you to your plane quicker and receive discounts at coffee stores, Passbook was meant to be the killer feature for developers to hook their apps into. You could ditch those paper coupons or plastic cards and use your iPhone to get the scoops and deals. But hardly anybody uses it. Granted, Starbucks remains the largest user of the service, but without wider developer support, its potential is going widely untapped.