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With the VGA or HDMI adapter, any standard projector. Put pictures in an album and play the slideshow or a Keynote presentation.
 
Saw a few of the youtube videos on the Pico Projector. I would like Apple to integrate that into the next iPhone 5. It would be so cool to project photos off a wall without a group of people hovering to see the image, and of course, without having to carry around another device. Cool Stuff though.
 
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