From Dan Leeman:
So, you need an image for your blog?
We’ve spent some time categorizing our favorite sources for free images and organizing them in such a way as to help you find what you’re looking for. Here are the criteria we’ve examined:
Subjects: Does a site focus on specific genres of images, or is it a mass collection of various image types?
High Resolution: Lots of great image resources emerged in the pre-Web 2.0 phase, but it wasn’t until bandwidth dramatically increased that allowed for the uploading of much higher resolution images suitable for editing and printing.
License: The licenses vary extremely from source to source. Some are listed as Creative Commons (with variations on attribution and availability for commercial use), others are Public Domain, and still others have unique licenses that maintain copyright while allowing users to download or embed photographs. To better understand Creative Commons licenses, check out our post on Images, Copyright, & Creative Commons.