I must have trouble “thinking outside the box” because I find it difficult to think of many library applications for photo sharing, at least where health sciences libraries are concerned. Until looking at the LC flickr site, it did not occur to me how useful this would be for increasing the knowledge and use of unique archival collections.
We do have unique special collections in our library and I will have some part time duties where those collections are concerned, so maybe photo sharing has some potential in the future–perhaps as an alternative or supplement to full-fledged formal online exhibits.
Photo sharing could be useful for publicizing or reporting on special events (sponsored lectures, receptions, etc.) that have already taken place.