I recently explored Flickr a little bit and enjoyed the site quite a bit. It is a creative way to organize and share online (digital) images with just a small group of friends or even a large public group and truthfully not only could be a useful sharing tool but potentially a creative and fun way for people and students to find images on certain topics thorough the use of tagging.
My lack of a digital camera right now prevents me from joining in the fun a bit more, but I browsed some of the images and looked up some photos of one of the places I've always wanted to go but never have... the Library of Congress (LOC). There actually were a good number of images on Flickr seaching by "Library of Congress". The image itself was tagged with library of congress along with several other words including America, USA and Washington DC. The one by Christopher Chan at http://www.flickr.com/photos/chanc/311882339/ is one of my favorites because it gives a good idea of the space and lighting inside of part of the main building.