I know of a PPC site. 4bc.co
They pay 0.00000157 BTC for each click you deliver.
Here's my link to their site http://aff.4bc.co/1765-3-3-6.html


For the rest I know only PTP programs where you earn in USD and later can convert that to BTC, either via their program or via payment processor. But they aren't that many.