What would be great would be an AirTunes bidule. If we could set up several airtunes objects it would be fantastic. I'd love to play my bidules on my hifi's. Or better yet, stream to several different AirTunes systems.
Also multi-channel (dolby?) encoder would enable wireless transport from a laptop to surround systems.
I haven't followed it that much but my understanding was:
- you can send to any Airplay from an app on iOS if the app is coded accordingly - only iTunes can send on OS X (without using AirFoil or something similar) - you can license from Apple to build hardware available as Airplay destination.
Bottom line, there is currently no way for an app to send to Airplay on OS X using any API...