Audio software developer Rogue Amoeba has announced the release of AirFoil Speakers Touch, an app for the iPhone and iPod touch that extends the capabilities of the previously available AirFoil application. AirFoil, available for the and , enables users to share audio from their computers to AirPort Express base stations, Apple TVs, Macs, PCs, and Linux boxes. The application syncs audio playback across devices, and can share files from a variety of sources including iTunes, RealPlayer, Spotify, and even Web-based sources like Pandora or Last.fm. (Without Airfoil, you can play music wirelessly only to an AirPort Express or Apple TV, and only from iTunes.)
 now extends those capabilities to the iPhone and iPod touch. You can plug in headphones or dock your device to a speaker to listen in on the wirelessly shared playback. This is great for listening to audio that comes from a source other than iTunes or for streaming audio from iTunes to an iPhone or iPod touch that lacks space for the audio files.
AirFoil Speakers Touch is currently available as a free download from the App Store, and works in conjunction with Airfoil for Mac or Windows (both $25), which are available for download via Rogue Amoeba's Web site. Whether you're already a fan of AirFoil or are newly searching for a way to untether your audio, AirFoil Speakers Touch is worth checking out.