Using Flickr in the classroom:

Using Flickr to annotate news articles from Tom Barrett
"Today I asked some of my children to use a scanned example of a newspaper article in Flickr and add notes to it. Basically they were finding examples of language features that we have annotated in a more traditional way in their books." See sample here.

Using Flickr, have students write creative short stories based on a picture, and then tag the picture "Flicktion."

Geotagging in Flickr:
Flickr's great for exploring photos by photographer, tag, time, text and group, and now it's also great for exploring photos by place. There are a couple of short video tutorials (or "screencasts") which give the 90 second overview on how to geotag your own photos and how to use all the controls for searching and exploring geotagged photos. Watching them first will give you all of the information you need to get up and running. Read another example of how to geo-tag photos for education.