Considering that we already have some well established companies doing this (eg. <a href="http://picscout.com/" rel="nofollow">http://picscout.com/</a>, <a href="http://ideeinc.com" rel="nofollow">http://ideeinc.com</a>) but aiming for huge clients (corbis, getty, jupiter), how big do you believe the demand for a free or low-cost service would be ? Think about the average professional or amateur photographer/image producer.