I recently invoiced a company for the use of my images to be used on a Web site promoting a Hampton Beach Hotel. The Web site designer called me and we agreed on usage rights. She then published the photos but would not return my calls. Finally, through the use of "whois" I was able to find a contact for someone who put me in touch with a different contact, who I billed for the usage rights. Payment is on the way.
On a different note...A record company in the UK paid the invoice I sent. They had used my Freak Out Carnival Ride image on a CD cover without my permission.
Ironically, the copyright was infringed upon twice. First by a Lion's Club Web site creator. When the image was copied to the Lion's Club site, my contact info and copyright notice had been cropped off.
The "artist" who created the CD cover claimed:
"As you can see there was no visible copyright or rights of ownership for the image and from looking at the other pictures of the ride on the site I just thought these were personal snaps from the fair. I do apologize for the misunderstanding here and I am happy to remove the artwork from the release if necessary."