We've all had the problem of searching for the perfect image for a presentation, site or blog, finding it and then not being certain about whether or not it can be used. One solution is to search within images that are already "shared" by their creators. Take a look at "Copyrightfriendly" to view a list of media collections with "generous copyright licensing". As it says on the site "[t]hough you may not need to ask permission to use them when publishing on the Web for educational purposes, you should cite or attribute these images to their creators unless otherwise notified!"
