Global sweep satellite images with fires highlighted. Finding a particular area on a particular day can be tricky, as there are a lot of images here. Also includes a gallery of interesting images, such as dust storms, typhoons, phytoplankton blooms, etc.
dead link: http://rapidfire.sci.gsfc.nasa.gov/
PhotoBreed is a source for "high quality stock photography" and Photoshop paint brushes. It claims to be a collaboration between artists for other artists, but the details of that are vague, as are the terms of use for the images.
dead link: http://photobreed.com/
A source for "free high resolution digital stock photography". The site is a bit vague about who took the photos and the exact usage terms.
OpenPhoto.net is a site for Creative Commons licensed photographs. The original only had photographs from the prject founder, this next generation version is open to all.
dead link: http://o2.openphoto.net:8080/
qz thoughts