Update: CoM says a tipster tells them this is because Airfoil Speakers Touch may be duplicating functionality we're going to see in iOS 6. That was our guess as well.
Apple has pulled Rogue Amoeba's Airfoil Speakers Touch from the App Store. The app, which made it possible to stream from a computer to an iOS-capable device using Airfoil, had been on the store since 2009. Airfoil Speakers Touch 3 was released last month.
The developers say that Apple informed them of the removal on Tuesday, but did not receive a clear answer as to why Apple removed the app. As far as they can tell, they're in full compliance. Airfoil Speakers Touch 3 added the ability to receive audio from other iOS devices and iTunes.
We'll have more on this story as it develops.