I post most of my photos to Flickr under a Creative Commons Attribution license. Today, I received some nice positive feedback for doing so.
Schmap publishes travel guidebooks in electronic form; each book has maps, links, reviews, and photos. They gather photos, at least in part, by trawling Flickr and looking for photos under CC licenses of particular attractions. They’re now using two of my photos in their Copenhagen guide. Not that the photos are particularly great, I must admit, but they’re still useful in illustrating that there are more picturesque castles in Denmark than the rather drab Amalienborg. I’m happy to have helped out.