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Or you could look into the free/low cost affiliate scripts at places like hotscripts.
They do CPA, CPC, CPS.
One thing I like about clickbank, is they are your CC merchant as well. They only do %sale, though.
nym_fan, what kind of program are you looking for? CPC, %sale? What is the typical product price? That can also make a difference.
Please let us know what you end up using, and how it works out for you.
I have also used 2Checkout.com for another site of mine. It appears now that they support third party tracking software-thus to be used for affiliates. They do not have anything written done formally about this, I just found it in the admin area.