If you're a blogger, photo researcher or designer you're going to love this cool website which offers an excellent way of finding free images for use in your projects. Photoree describes itself as the equivalent of last.fm and stumbleupon, but for images. Essentially it serves up images based on your preferences. On signing up you create some filters to let the search know what you're interested in. Then, by rating what the site serves up you effectively fine tune these filters so the quality and relevance of images it suggests should improve as you use it.
It is a great idea and even without specifying free images only most of the content Photoree is indexing at the moment is creative commons, so it is a very effective way of creating a regular automated lookout for free to use images you might be interested in on Flickr.
Click here to visit Photoree.
Click here for more on finding free photos on Flickr.