Most people who are looking for images to use will be aware of flickr (free – read about how the licencing works) and istockphoto (cheap), but from the comments on the post, I found a few sites that I’d only vaguely heard of, or long forgotten:
- Zemanta – a wordpress plug-in, firefox extension, and website that helps with image searching
- stock.xchng – free stock photography
- Photo Dropper – another wordpress plugin
- morgueFile – free stock photography
- flickr storm – flickr search interface
- flickrleech – another flickr search interface
- compfight – flickr search interface, in my opinion the best of the ones in this list.