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.
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.