[gbhgbh]

I'm trying to find a way to quickly switch the sound input and output sources in System Preferences. My situation is that I'm receiving phone calls through my computer, for this I'd like to have sound coming through the speakers so that I can hear it ring, but would like to quickly switch to USB headphones when I answer. Ideally, I'd like to have an icon in the dock that would toggle USB on and off when clicked. What are some of the ways to achieve a quick switch of the sound source?

[Big Mac]

Maybe SoundSource is what you're looking for. There are a couple of different shareware and freeware apps fitting your description over at VersionTracker. I used the keywords sound output.

[gbhgbh]

This is just what I was looking for. I thought I'd have to write an AppleScript or small applet.

Thanks,
Greg