YogY: Thanks! As far as Spotify goes, it's something we want to support. Unfortunately, the application doesn't currently support AppleScript, making it much more difficult to work with. We'll see what happens though.

Sam Webb: Airfoil and Airfoil Video Player, combined with an AirPort Express, could potentially do what you're after. I'm not certain it will work perfectly as a full-time solution - it depends in large part on how powerful the iMac is. Airfoil Video Player requires a good chunk of CPU to do what it does.

That said, Airfoil itself is free to test, so you can see if this may work for you.

KiltBear: Desire? Sure. That's why Airfoil Speakers exists already. Unfortunately, sending from iOS devices isn't supported right now due to Apple. iOS (and iTunes) will only send to authorized AirPlay devices, and we don't have the ability to turn Airfoil Speakers into one of those. We'll see what happens in the future.

Paul Mayne: The Boxee Box is one of a number of platforms we'll be considering porting Airfoil Speakers to. We'll see!

powertogeeks: Unfortunately, there's not a lot we can suggest, besides switch to analog. We're as frustrated by this as anyone, but even the nature of the problem is not well understood. We've had users for whom iTunes works and Airfoil doesn't, for whom Airfoil works but iTunes doesn't, for whom neither works, and of course, for whom both work. It's something we hope will eventually be fixed, obviously, but we don't have a whole lot of control over it.

We have heard from some that the 7.5.2 firmware for the AirPort Express has improved things (as seen in Svein A's comment below yours).

Thomas: This is something we may add, but it's not planned for the near future update. For now, your best bet is Reemote, from 010dev.

Dana: Our store accepts payments via credit card or PayPal. Let's be clear though - Airfoil is a Mac OS X app, with an iOS sidekick. You need to run Airfoil on your Mac.