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Great news! We've just released a Blurb App for the iPhone and iPad - it's currently only available for those in the US.
The app allows you to pull images directly from your phone's albums. You can organize your images, change your layouts, add captions, upload and order your book all from the app. It also offers a fun new 5x5 size!
You can find it in the Apple store here. Give it a try and leave us a rating!