everystockphoto.com is another great resource for free stock photos. everystockphoto is indexing over 250,000 creative commons, public domain and other attribution licensed photos.It displays a medium verison of the photos when possible and as much information about the photo. The search is tag-based for applicable sites and indexes the results based on description, category, username, keywords, and title.
Ajax is used nicely in retrieving links from del.icio.us, ajax-based tagging tools and an AJAX based advanced search interface will be up shortly. In addition, it offers free member features such as tag-based lightboxes, photo pop-ups, and a forum.

Jonathan Yapp also tells about plans on morphing into an image exchange but keeping the focus on free media and related resources in mind. Everystockphoto is currently adding about 20,000 new photos per week. It sure has a good scope in the market as there are always photo hungry people/designers, especially for free ones ;) . Freebie site always pick up fast, I have noted few good ones after the success of stock.xchng like everystockphotos and IconBuffet