Rogue Amoeba Software today released Airfoil 2.0, a utility designed as a companion to AirPort Express, enabling any audio (not just iTunes) to be sent to the device. New and enhanced features include: support for multiple AirPort Express units; support for sending audio to password-protected units; audio effects, including a 10 band equalizer, as well as volume and balance controls; the ability to send audio from new sources, including USB radios, Dashboard widgets, and audio devices; full AppleScript support; and more. Airfoil 2.0 is priced at US$25 (free for registered users). A free demo is also available.