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Safari has a new feature that gives you makes articles look more like an RSS feed.. With iOS 5 and Safari you can e-mail the article itself, not just the link.
Jobs demonstrates how you can work on a presentation in iWork then get it synched to another device.
Apps can store documents in iCloud. iCloud pushes documents automatically, and documents get updated on all devices.
To make this happen, there are new iCloud storage APIs for developers.