[dmurko]

Clickbank (www.clickbank.com) which is used by most internet/affiliate marketers is a great solution if you don't mind that they'll manage all your billing/affiliate transactions. They have a secure shopping cart, they automatically pay affiliates and the setup is just 50$ or something. But they do take about 10% of each transaction.

But you can't review your affiliates or in anyway edit their payment process.

On the other hand they have over 10.000 affiliates in all niches.

It all depends on what your priorities are - do you want an army of affiliates or would you just like to offer the program to a few selected ones.

(I'm in no way affiliated with Clickbank, we're also looking for payment processing for our web app)