Rogue Amoeba Software has announced the release of Airfoil (originally announced as Slipstream), its new software to send audio from any application directly to Apple’s AirPort Express. “Everyone who owns one of Apple’s popular AirPort Express devices will be thrilled to be able to send audio from applications like RealPlayer, Windows Media Player, QuickTime, and Safari right to their remote speakers,” says the developer. “In just seconds, Airfoil can send audio from almost any application on OS X directly to the AirPort Express.” Airfoil is available at the introductory price of US$20.