If you do a lot of web design or print publication design, you probably need a lot of graphics to put on them. A major problem, however, is that these often come with royalties and copyright restrictions. There are many royalty-free photos out there, but the problem is finding them in a timely manner.
Enter, EveryStockPhoto.com. ESP makes searching for Creative Commons photos easy. (Creative Commons is a special system designed to promote organized free sharing of digital material.) Just go to the website, type in a search query and select the license you want the results to be under and it retrieves a matrix of images for you in a similar way to Google Images. Click on an image to see its license and download link. Most images have an attribution license, which means that you can share, remix, and use the photo in your project, as long as you credit the source- usually a URL will do.