Using visuals in the classroom always good.
Flickr and Picasa are just a few of the photo tools out there.
Use photos in the classroom to:
Inspire writing, reflections, raise questions etc.
Create a series of events - time capzles with Capzles
Intergrate into a presentation- with slide share
Make photo into a discussion with voice thread
Text to video with Xtranormal
more ideas and sources:
Tom Barrett -35 interesting ways to use your pocket video camera in the classroom
Accessible Educational Technology: A Picture Can Create a Thousand Words