I've got iTunes. Who doesn't? Not long ago I ripped nearly all my CDs into iTunes (still some to go out of a rather large collection). That's great for my iPod, but then what? How do I play these tunes on my stereos?
Enter Airport Express. The Airport Express receives a stream of audio over a wireless or wired network. iTunes pushes out music to the Airport Express just as if it were playing on my computer's speakers. The Airport Express has a stereo mini jack so that it can plug directly into an input port on my stereo. Aside from setting up a wireless network, it works that easily.
After a while I decided I had exactly the same problem with Pandora. But darn Apple and their little closed environment. How do I get Pandora to my stereo? Check back after I give Airfoil a try.