Changing Audio output for individual applications?

[iFargle]

I'm wondering if there's a way to change audio output for individual applications in Windows Vista SP2 x64. Any ideas? I can't find out how. I have a blue tooth headset I use for Steam and I'd like the Steam application (the games I don't care about, I only want the Steam.exe application to output)

In my devices list, I have:
Playback Devices:
Speakers (2- Bluetooth Audio Device)
Speakers (High Definition Audio Device) Working (This is the default device)
Digital Output Device (SPDIF) (High Definition Audio Device) Working

Recording Devices:
Microphone (2-Bluetooth Audio Device) Working (This is the defualt device)
Microphone (High Definition Audio Device) Currently Unavailable
Microphone (High Definition Audio Device) Currently Unavailable
Line In (High Definition Audio Device) Working

And in the Volume Mixer I have....
Device: Speakers (High Definition Audio Device)
Applications: Windows Sounds, Firefox, TosBtHSP, Steam, iTunes, and Digsby

Device: Speakers (2-Bluetooth Audio Device)
TosBtHSP, Steam, iTunes

But none of those applications are putting out any sound through the bluetooth headset.

Any ideas? Any applications I can use to help me? Thanks for any help