Here'a a nice affiliate cloaking script i've found that also lets you sell and deliver digital downloads via paypal, ejunkie AND clickbank. I'm using it on a theme site and it works flawlessly. It was $29 but they're running a special promo where you can grab this wordpress plugin for $1: Wp Sales Demon Don;t know how long it's going to stay at that price, but i'm kicking myself that i paid $29...ARGH!