Apparently you can use copyright protected images on your website as long as the size is right. Google was recently named in a copyright infringement lawsuit filed by Perfect 10 for displaying thumbnail images from Perfect10.com. However, because the pictures had a length between 80-200 pixels, they were considered to be in "fair use".

According to an article in the LA Times, "Fair use is a defense that allows the use of copyrighted works, under certain circumstances, without the owner's consent." Resize any picture you want and post it on your website worry-free!