Never again will you fall in love with a manthra :p
http://www.bookblog.net/gender/genie.html
j/k but it was interesting since I took a few articles and it seemed spot on with every author's gender. I took a Rolling Stones article, a CNN article, a Netscape blog and a few others for the heck of it and it got them all right since the author's names were identifiable male/female names. It was fun to play with. Of course, it's not exactly perfect. Try it yourself but try large blogs/articles consisting of 500 words or more since I tried a few with less than wording and it seems to fail then :p
example: since the above post is only 94 words I am recoginized as a female blogger >.<