Flickr has an option in it's search options that allows you to search for commercially distributable pictures.
It looks like all of clker's art is public domain and freely usable.
Wikimedia Commons is served by the same organization as Wikipedia. They have a nice collection of public domain pictures that can be freely redistributed.
Searching for free pictures will find lots of pictures that can only be used for personal use. You will have to search for 'public domain' or 'creative commons' as well to find redistributable pictures.
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