POF.com. It sucks though, for me at least.
I tried to register there the other day, but all it did was output a dating profile and didn't actually save any account info - even though I filled out the whole thing 3 times. I guess the site doesn't work well with Chrome. Not really motivated to go through the whole kink-filled forms again.
On the other hand, I'm getting a bit tired of always seeing the same dozen or so girls in my area on OKC...