It seems like he deleted my comment from his site's disqus (it's his right) but I rewrote the exact same API in a couple of lines using sexmachine and ruby (I had been meaning to try Sinatra anyway). The source is here: https://github.com/rajington/genderizer

Hosted on heroku's free tier here are some more interesting examples:

Basic: http://genderizer.herokuapp.com/?name=peter

  {"peter":"male"}

"Mostly" Response: http://genderizer.herokuapp.com/?name=Jamie

  {"Jamie":"mostly_female"}

Country (helps with guesses, default USA): http://genderizer.herokuapp.com/?name=Jamie&country=great_br...

  {"Jamie":"mostly_male"}