When I ran across this site, I was reminded of something that happened to a good friend of mine who has a web based marketing business. He had a person who was building web sites for him, and had a tendency to just see a picture on a website and would use it.
One day my friend got an email from Getty images that said “Hello. We are glad you like our image well enough to include in your website. Please send us payment of $600.” Of course my friend freaked out and took the picture down. Two weeks later he got another email from Getty Images: “Hello. We are sorry you do not like our image as well as you did two weeks ago. Please send us payment of $600”
The bottom line is this: copyright infringement can be costly. Check out the link below for information on how to locate and use images that are not copyrighted.