University of Utah
University of Utah: Genetic Science Learning Center: Cloning in Focus
This group of pages comprehensively covers the topic of cloning. There is an interactive section about how it's done, some history of cloning technology, important issues in cloning, and even an interactive quiz.
American Museum of Natural History
American Museum of Natural History: O Logy: All About Cloning
Learn what cloning is, how it works, what animals have been cloned, and about Dolly, the first mammal (a sheep) to be cloned from an adult cell. Click on the links to see flash cards on the topics.
Other
Tech Museum of Innovation: Cloning
As part of the online exhibit on Genetics from the Tech Museum of Innovation, this site deals with cloning and specifically cloning research and details on genetics.