Here’s an interesting link: http://bookblog.net/gender/genie.php. This site takes whatever you’ve written – fiction, non-fiction, or blog entry (presumably they think these tend to sit somewhere between the first two options) – and then deduces whether you’re male or female.
Fortunately my first two posts here both came back as having been written by a male. The first got a male/female score of 299/236 and the second (being longer) a score of 656/496.
The site uses an algorithm that looks for certain words and tallies up the number of times you use them. Apparently the most masculine words include “what”, “more” and “many”, whilst the most feminine words include “me”, “myself” and “hers”. No further comment necessary.