iPhone OS 4.0 on video

Developers have had access to a preview of version 4.0 the iPhone OS since it was launched last week, and the first videos have begun to do the rounds online.

This is one of the best we've seen so far: it's clear, well shot and talks through most of the features.  It's easier to see how multitasking will work, how apps will be stored across multiple folders and what wallpapers on the home screen will actually look like.

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