I think a great way to use digital photography in the classroom is for writing assignments. When I was in the sixth grade, my teacher asked us to find a photo of ourselves that has a background story to it to write about. Another great way to incorporate digital photography in the classroom is to have students go take a picture of nature and build a project around this. They can take a picture of an interesting plant, animal, or whatnot and conduct research on this plant and possibly create a project around this. This would allow for students to explore the nature that is around them. Therefore, I think digital photography is a great way for students to explore the world around them which they can further learn more about by bringing their findings back into the classroom. I have also seen digital photography being used for understanding vocabulary. In a classroom I have subbed in, I saw that the teacher took actual pictures of the vocabulary words that students had been working on that week.
One drawback to digital photography is that teachers need to get access to tools that allow students to take pictures. If teachers have access to a class set of Ipads, then they can use this to take pictures. However, it is likely that students will not have access to a Polaroid.