Flickr would be helpful for finding photos relevant to material being taught to add to Power Point notes in a foreign language classroom. There are a ton of recent travel photos I could use- perhaps more updated than those in our textbook. I could also see my Spanish students using Flickr to find photos for an upcoming assignment (they will be pretending to be travel agents selling a travel package to a specific city or group of cities in Spanish-speaking countries). They will need several photos for their presentations and brochures. Perhaps I could even limit them to using only Flickr to teach them how to cite photos. This might make things easier. A concern, of course, would be the students stumbling across inappropriate photos...especially travel photos.
I already use images as writing prompts in English class. I could start to look for images on Flickr and group them together for future use.
We have a digital photography class at Bedford, and I know the teacher has his students publish photos on Flickr. I could always ask him for more ideas about how to use Flickr and how to solve problems.
Another idea is that I could publish photos from my personal travels to share with my students. It might be easier having them all on one website and just uploading them to Flickr rather than copy/paste into Power Point.