Dating sites, main stream: Match, eHarmony and who else is big? Other than POF?
Be2, Cupid, Date.com, the PeopleMeet offers etc...
You could also take a look at that list, might give you some additional ones:
http://www.alexa.com/topsites/catego...onships/Dating
Are you asking about dating sites with offers, or dating sites in general?
If it's dating sites in general, rather than ones with offers, OKCupid would be the obvious other one.
With Offers.
Zoosk used to be a biggie too, but it doesn't look like they're accepting new publishers (publically at least)