PBS
Pbs Learning Media: Life's Greatest Miracle: Stem Cell Debate
This essay from NOVA: "Life's Greatest Miracle" explores the debate over the use of embryonic stem cells in scientific research.
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.