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Enter text into a box, choose fiction, non-fiction, or blog entry, and click "submit." The Gender Genie at BookBlog.net claims to know if you are a man or a woman.
The New York Times Magazine published an article and a test that inspired "the Gender Genie." According to the Bookblog website, "It's a simplified version of an algorithm developed by Moshe Koppel, Bar-Ilan University in Israel, and Shlomo Argamon, Illinois Institute of Technology, to predict the gender of an author."
Try it! I copied & pasted the text from the library's previous blog entry about Del.icio.us, which seemed neutral to me. Alas, it pegged the author as "female."