You can download the latest sample PhotoScroller code , which contains a similar implementation of the photo application. Here, for both orientations, swipe and individual image scale are implemented using UIScrollViews and CATiledLayer.
It does not contain thumbnail code, however it is relatively easy to create using the simple UIScrollView encoding. And according to Jesse Nauger's comment, you can also use the old Three20 library written by Joe Hewitt.
Scrolling Madness is relatively easy to use from both of the above.
Another library on GitHub - FGallery-iPhone
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