Join4free is just getting better in ratios for me.
If you haven't joined them yet join thru this
Join4free
You can also use Nex-cash. They are promoting join4free and in this way you'll get 0.03$ for every click (blind or even mouseover) without worring about signups.
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Sex4it Tgp
Blind links No conversion Ratios! Nex-cash Roks!