Including photos in your publications makes them look great and also makes them more appealing to your readers. If you are looking for images for your newsletter, blog or other publication, take a look at some of the free photo sites that are available on the web.
Flickr - a photo sharing site. Search for CC licensed photos
Freeimages - just like its says! Photographers can contribute too
Photopin - searches Flickr for CC licensed photos with a filter for Commercial or Non-Commercial License