Once someone stole a picture from me. I complained about it here. Upon closer examination, I found myself guilty of doing the same thing -- not checking to make sure that the image was in the public doman. I've removed the two pictures on my blog and will try to get permission or find other pictures.
I urge you all to make sure that the pictures and excerpts you use are in fact allowed. Here's a link to discerning what constitutes fair use. It's not always clear and if in doubt, leave it out.