I fed it several samples from both Carnivorous Cow and HACkers blog, and the results were interesting - if unexpected.
HACkers blog was consistently androgynous, scoring ever so slightly ahead on the female score on occasion, so on balance, possibly female (just!).
But the Gender Genie decided that the Cow must be male! All the samples from the Cow's blog came out as overwhelmingly male.
Identity crisis, anyone?
The algorithm works on writing style, rather than content, and searches for the frequency of certain words / word types in the text, and works best on blocks of text of 500 words or longer.