Wheaties - I've got a few sponsors you might want to take a look at, but considering I don't know what niche you're interested in promoting I'll try and list sponsors with different types of sites. Hope this helps.
Pimp Roll - several hundred sites to promote.
OC Cash - all of their content is exclusive.
Nasty Dollars - all exclusive and tons of galleries.
Naughty America - original sites with great retention.
Paper Street Cash - newer sponsor with quality content and frequent updates.