Just picked up the following off a library mailing list ...
FREELANCERS WIN PAYMENT FOR CD-ROM ARTICLES AND PHOTOS – In another victory for digital freelancers, the U.S. Supreme Court has ruled that National Geographic must pay freelance journalists for the use of their stories and photographs on a CD-ROM. On Oct 9, the Supreme Court dismissed an appeal by the magazine, which insisted it would be impossible to track down all the freelancers whose photographs and articles were used in the magazine from 1888 to 1996. The Court held that features of the CD-ROM such as music and advertisements made it a new product for which freelancers should be paid.
Not sure exactly what the implications are, BUT, it might be worth filing away if at some time in the future you find one of your pics appearing on someone else's CD!