On female vs. male writing, check this out:
The Gender Genie
A little programme analyses snippets (of more than 500 words) and tells you if the text was written by a female or a male. The general idea is that there are statistical differences in the use of words (simple ones like "with" or "around"), between genders.
I bet it could figure out my gender very easily, because of my tendency to qualify what I've said in practically every other sentence (though I do edit a lot of them out) which is probably a female thing (at least among females of my generation).
Ye gods, where would I be without parenthesis and dashes!