Why not just put the CCBill affiliate code in the blog url? Use mod-rewrites if you want it more se friendly, use php to pull the affiliate number for any sponsor links. Of course assuming there will only be one affilate number for all links. If more than one, could use a DB, easy. I dont know wordpress, but it would be just a matter of echo'ing the affiliate id/number, cant see why wordpress could'nt do that.
Or I am completing missing the job..
Boogie did a affiliate blog some time back, that still going?
ronnie