Just upgraded to it from 1.5 for 3.95.
Let me show you something :
"BlueCast streams your podcasts, music, voice notes, game sounds, and more, to Bluetooth headsets that support the hands-free Bluetooth profile. BlueCast gives control to applications when they ask and takes back control as soon as they are done. This allows for seamless listening all without wires, yes the days of having to untangle your headphone cords are done."
BlueMusic that +
Disable ringtones while Bluemusic is on: forget about the annoying ringtones being played loud in your ears!
Resume your Bluetooth Audio Playback immediatelly after any phone call. Assign the right softkey to Bluemusic, so you can have access to the application from anywhere
On-call triggers for Speakerphone, Answer Call and Reject call
Need .NET Compact Framework ( 6Mb extra on your device)?
Bluecast : Yes
BlueMusic : NO
Bluecast : 20$
BlueMusic : 9.95 Euro ~ 12.95$
Hmm... i think my choice has enough reasons