Brilliant idea by Greg Elkin. Annotate areas on photos using a Wiki like Web interface, indicate annotations visually right on the photo.
In my course last quarter, some students developed Web based annotation of historical JPEG images. They didn't go the last 2 miles by making it Wiki like and showing the annotations on the image.
Here's a next step for Fotowikis. Use Flash to display the images + annotations, and then employ Magic Lenses and Photoshop style layers to deal with plethoras (is that a word?) of annotations.