With opt-in e-mails, you can pay a service of a small or large fee (depending on the number of people you want to see your site) for them to email their HUGE subscriber list.people who are subscribed to these sites get paid a few cents to read these emails.

They are also targeted by their interests! So if you have a music site you can have the service, email your site for all there music lovers. Here is a great place for this service, Blast Your Ad .