Here is an article by George Weigel discussing this recently released Catholic document on bio-ethics called Dignitas Personae (The Dignity of the Person).  Fertility technologies, genetic engineering, cloning and embryonic research are all considered.  

The document is typically Catholic, advocating a robust synthesis between faith and reason and focusing steadfastly on the dignity of the human person.  It is in no way ‘anti-science’, calling ‘science an invaluable service to the integral good of the life and dignity of every human being.’  But science must be unconditional in her respect for the dignity of all human persons.  Science uninformed by humanity is simply a tool for ever grosser tyranny.