I suppose any other dating sites that break through will be based on extremely simple ideas with elegant or new user interfaces. For example, How About We is an extremely simple idea. The concept of dating friends of friends was already tried several times. The last time I heard of it it was being done by circl.es. I would suggest trying something that is really unique that nobody has ever heard of which would help you break out. I hate to say it but one of the other stories in the last year that was a break out story was Ms. Travel. Try to package what you're doing in a really crazy way. I hacked together a crazy photosheet interface that I've never seen before and it just wouldn't catch. Trying to think of any other thing I could think of which nobody has done, I tried the idea of online dating via the unix command line. That did get me some exposure but certainly not enough to get the wheels of traction turning.
For what it's worth, here's a story that came out on Jezebel.com about my project at the time (which I shut off after a couple of weeks after this article came out).
http://jezebel.com/5934969/new-techy-online-dating-site-is-u...
Good luck w your project!