LOVE this app! I needed a way to stream Pandora radio to all my airport airtunes locations in my house and I couldn't find a way to do it. I was able to stream my itunes music throughout my house, but not Pandora radio. After a few google searches, I came across Airfoil and decided to give it a shot. It took me less than 5 minutes to configure and then it automatically saw all 3 of my stereos throughout the house (front room speakers, living room, and backyard). VERY easy to use...and it works great. No complaints so far.
Also the customer service is top notch. I emailed asking if they were planning an iphone app like the itunes Remote app that would allow me to control Pandora over my airport network and got a response within a couple hours. They were very receptive to the idea and the email was very kind. I highly recommend Rogue Amoeba and Airfoil.