This WP plugin looks amazing – it finds Flickr Creative Commons licenced images all from within WP.
“With the Photo Dropper plugin, you can now search millions of Flickr photos and add them to your WordPress posts with just 1 click, all without leaving your WordPress dashboard. Attribution links are automatically added underneath the images to comply with the Creative Commons license rules. It’s the easiest way to add photos to your blog. Period. And best of all – it’s Free!”