Meta Slideshow is an easy photo slideshow viewer, which also shows the metadata of a photo:
It will show the description, the date and the camera settings of that photo. For example "Christmas day - Dec 25th, 2011 - f2.4 1/60s ISO 100".
It will show all images on your device, in random order. A great feature is that you can easily go back to a picture that was shown earlier in the slideshow. You can slide back to any of the previous photos. Great when someone says: did you see that?
This slideshow app also offers a great range of times between the transitions: from 2 seconds to 30 minutes.
Meta Slideshow is a great app that helps you view your images, even including metadata!