Admittedly not all the money making opportunities that I have used pan out. But so far I'm loving Freebies4Webmasters (F4W). They were running a promotion that they paid GBP 10.00 which was paid shortly after they approved my domain. [I am not sure if they are still running that promotion or not.] Today in my email I received a notice that I had a payment of GBP 5.00. It was my first monthly payment from F4W! So far I have made $25.86 with them.
It is an easy signup and so far they have made quick payments. I'm planning on adding some additional domains to my account because they pay GBP 5.00 per month per domain.