Castration: An Abbreviated History of Western Manhood 
A review of the book by Gary Taylor which looks at eunuchs through the ages.
http://www.salon.com/books/review/2000/12/13/taylor/The Eunuchs of China
About the practice of using emasculated and castrated males to serve in the emperor's harem from the 8th century B.C. to 1912.
http://www.usrf.org/news/010308-eunuchs_china.html
The Story of My Misfortunes
Full text from Peter Abelard's Historia Calamitatum, which recounts his affair with Heloise and subsequent castration.
http://www.fordham.edu/halsall/basis/abelard-histcal.html
The Pen(is), Castration, and Identity: Abelard's Negotiations of Gender
Paper about Abelard's narratives of emasculation and remasculinization .
http://www.georgetown.edu/labyrinth/conf/cs95/papers/irvine.html
