Quick Sound Switch
QuickSoundSwitch is a small System Tray tool, which allows you to switch the default sound device with only one click.
It is useful for PCs with more than one soundcard (or for example soundcard + USB headset..)!
Windows 2000 and XP
Windows Vista and Windows 7
For more information, visit,
http://www.toflo.de/Downloads/Tools/Soundcard-Switcher/eng/index.html