While a test release has been around for a few months, last night PulseAudio 0.9.15 was officially released. This open-source sound server has a number of significant enhancements in this latest update. PulseAudio 0.9.15 introduces native support of Bluetooth audio devices using BlueZ, Apple Airport Express support, flat volume support (similar to Vista's audio controls), on-the-fly reconfiguration of audio devices, and native support for 24-bit samples. The on-the-fly reconfiguration of audio devices is great and as a result there is now proper S/PDIF support.
With the release of PulseAudio 0.9.15 also comes an update to the PulseAudio Volume Control program. The PulseAudio Volume Control 0.9.8 update brings support for configuring sound card profiles and various other updates.
The complete list of all of the changes that went into PulseAudio 0.9.15 can be found on their milestone page
. There is also a more detailed overview on this sound server release here
. Information concerning the PulseAudio Volume Control update can be found on this web-page