I would be very wary of the secular dating sites. I did them 2.5 years ago and many of the people there lie. I was fortunate and met a man on Yahoo!.com. He is cradle Orthodox but not a church goer and I was not Orthodox. Now I have converted and he is back in church. We are married and very happy.
I wonder what it would take to create an Orthodox dating site and if the Church would sanction it.